luasocket: fix build with uClibc without IPv6

see http://autobuild.buildroot.net/results/698/6989e71bf50946d62b696dbe07e8f00679b6aad9/

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/luasocket/luasocket-01-uClibc-IPv6.patch

@@ -0,0 +1,217 @@
+fix build with uClibc without IPv6 support
+
+see Pull Request: https://github.com/diegonehab/luasocket/pull/90
+
+Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
+
+Index: b/luasocket-3.0-rc1/src/options.c
+===================================================================
+--- a/luasocket-3.0-rc1/src/options.c
++++ b/luasocket-3.0-rc1/src/options.c
+@@ -110,6 +110,7 @@
+     return opt_setboolean(L, ps, SOL_SOCKET, SO_BROADCAST);
+ }
+ 
++#ifdef IPV6_UNICAST_HOPS
+ int opt_set_ip6_unicast_hops(lua_State *L, p_socket ps)
+ {
+   return opt_setint(L, ps, IPPROTO_IPV6, IPV6_UNICAST_HOPS);
+@@ -119,7 +120,9 @@
+ {
+   return opt_getint(L, ps, IPPROTO_IPV6, IPV6_UNICAST_HOPS);
+ }
++#endif
+ 
++#ifdef IPV6_MULTICAST_HOPS
+ int opt_set_ip6_multicast_hops(lua_State *L, p_socket ps)
+ {
+   return opt_setint(L, ps, IPPROTO_IPV6, IPV6_MULTICAST_HOPS);
+@@ -129,6 +132,7 @@
+ {
+   return opt_getint(L, ps, IPPROTO_IPV6, IPV6_MULTICAST_HOPS);
+ }
++#endif
+ 
+ int opt_set_ip_multicast_loop(lua_State *L, p_socket ps)
+ {
+@@ -140,6 +144,7 @@
+     return opt_getboolean(L, ps, IPPROTO_IP, IP_MULTICAST_LOOP);
+ }
+ 
++#ifdef IPV6_MULTICAST_LOOP
+ int opt_set_ip6_multicast_loop(lua_State *L, p_socket ps)
+ {
+     return opt_setboolean(L, ps, IPPROTO_IPV6, IPV6_MULTICAST_LOOP);
+@@ -149,6 +154,7 @@
+ {
+     return opt_getboolean(L, ps, IPPROTO_IPV6, IPV6_MULTICAST_LOOP);
+ }
++#endif
+ 
+ int opt_set_linger(lua_State *L, p_socket ps)
+ {
+@@ -221,16 +227,21 @@
+     return opt_setmembership(L, ps, IPPROTO_IP, IP_DROP_MEMBERSHIP);
+ }
+ 
++#ifdef IPV6_ADD_MEMBERSHIP
+ int opt_set_ip6_add_membership(lua_State *L, p_socket ps)
+ {
+     return opt_ip6_setmembership(L, ps, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP);
+ }
++#endif
+ 
++#ifdef IPV6_DROP_MEMBERSHIP
+ int opt_set_ip6_drop_membersip(lua_State *L, p_socket ps)
+ {
+     return opt_ip6_setmembership(L, ps, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP);
+ }
++#endif
+ 
++#ifdef IPV6_V6ONLY
+ int opt_get_ip6_v6only(lua_State *L, p_socket ps)
+ {
+     return opt_getboolean(L, ps, IPPROTO_IPV6, IPV6_V6ONLY);
+@@ -240,6 +251,7 @@
+ {
+     return opt_setboolean(L, ps, IPPROTO_IPV6, IPV6_V6ONLY);
+ }
++#endif
+ 
+ /*=========================================================================*\
+ * Auxiliar functions
+Index: b/luasocket-3.0-rc1/src/options.h
+===================================================================
+--- a/luasocket-3.0-rc1/src/options.h
++++ b/luasocket-3.0-rc1/src/options.h
+@@ -32,12 +32,24 @@
+ int opt_set_ip_multicast_loop(lua_State *L, p_socket ps);
+ int opt_set_ip_add_membership(lua_State *L, p_socket ps);
+ int opt_set_ip_drop_membersip(lua_State *L, p_socket ps);
++#ifdef IPV6_UNICAST_HOPS
+ int opt_set_ip6_unicast_hops(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_MULTICAST_HOPS
+ int opt_set_ip6_multicast_hops(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_MULTICAST_LOOP
+ int opt_set_ip6_multicast_loop(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_ADD_MEMBERSHIP
+ int opt_set_ip6_add_membership(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_DROP_MEMBERSHIP
+ int opt_set_ip6_drop_membersip(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_V6ONLY
+ int opt_set_ip6_v6only(lua_State *L, p_socket ps);
++#endif
+ 
+ /* supported options for getoption */
+ int opt_get_reuseaddr(lua_State *L, p_socket ps);
+@@ -48,10 +60,18 @@
+ int opt_get_ip_multicast_loop(lua_State *L, p_socket ps);
+ int opt_get_ip_multicast_if(lua_State *L, p_socket ps);
+ int opt_get_error(lua_State *L, p_socket ps);
++#ifdef IPV6_MULTICAST_LOOP
+ int opt_get_ip6_multicast_loop(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_MULTICAST_HOPS
+ int opt_get_ip6_multicast_hops(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_UNICAST_HOPS
+ int opt_get_ip6_unicast_hops(lua_State *L, p_socket ps);
++#endif
++#ifdef IPV6_V6ONLY
+ int opt_get_ip6_v6only(lua_State *L, p_socket ps); 
++#endif
+ 
+ /* invokes the appropriate option handler */
+ int opt_meth_setoption(lua_State *L, p_opt opt, p_socket ps);
+Index: b/luasocket-3.0-rc1/src/tcp.c
+===================================================================
+--- a/luasocket-3.0-rc1/src/tcp.c
++++ b/luasocket-3.0-rc1/src/tcp.c
+@@ -81,7 +81,9 @@
+     {"keepalive",   opt_set_keepalive},
+     {"reuseaddr",   opt_set_reuseaddr},
+     {"tcp-nodelay", opt_set_tcp_nodelay},
++#ifdef IPV6_V6ONLY
+     {"ipv6-v6only", opt_set_ip6_v6only},
++#endif
+     {"linger",      opt_set_linger},
+     {NULL,          NULL}
+ };
+@@ -366,11 +368,13 @@
+         auxiliar_setclass(L, "tcp{master}", -1);
+         /* initialize remaining structure fields */
+         socket_setnonblocking(&sock);
++#ifdef IPV6_V6ONLY
+         if (family == PF_INET6) {
+             int yes = 1;
+             setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
+                 (void *)&yes, sizeof(yes));
+         }
++#endif
+         tcp->sock = sock;
+         io_init(&tcp->io, (p_send) socket_send, (p_recv) socket_recv,
+                 (p_error) socket_ioerror, &tcp->sock);
+Index: b/luasocket-3.0-rc1/src/udp.c
+===================================================================
+--- a/luasocket-3.0-rc1/src/udp.c
++++ b/luasocket-3.0-rc1/src/udp.c
+@@ -78,12 +78,22 @@
+     {"ip-multicast-loop",    opt_set_ip_multicast_loop},
+     {"ip-add-membership",    opt_set_ip_add_membership},
+     {"ip-drop-membership",   opt_set_ip_drop_membersip},
++#ifdef IPV6_UNICAST_HOPS
+     {"ipv6-unicast-hops",    opt_set_ip6_unicast_hops},
+     {"ipv6-multicast-hops",  opt_set_ip6_unicast_hops},
++#endif
++#ifdef IPV6_MULTICAST_LOOP
+     {"ipv6-multicast-loop",  opt_set_ip6_multicast_loop},
++#endif
++#ifdef IPV6_ADD_MEMBERSHIP
+     {"ipv6-add-membership",  opt_set_ip6_add_membership},
++#endif
++#ifdef IPV6_DROP_MEMBERSHIP
+     {"ipv6-drop-membership", opt_set_ip6_drop_membersip},
++#endif
++#ifdef IPV6_V6ONLY
+     {"ipv6-v6only",          opt_set_ip6_v6only},
++#endif
+     {NULL,                   NULL}
+ };
+ 
+@@ -92,10 +102,16 @@
+     {"ip-multicast-if",      opt_get_ip_multicast_if},
+     {"ip-multicast-loop",    opt_get_ip_multicast_loop},
+     {"error",                opt_get_error},
++#ifdef IPV6_UNICAST_HOPS
+     {"ipv6-unicast-hops",    opt_get_ip6_unicast_hops},
+     {"ipv6-multicast-hops",  opt_get_ip6_unicast_hops},
++#endif
++#ifdef IPV6_MULTICAST_LOOP
+     {"ipv6-multicast-loop",  opt_get_ip6_multicast_loop},
++#endif
++#ifdef IPV6_V6ONLY
+     {"ipv6-v6only",          opt_get_ip6_v6only},
++#endif
+     {NULL,                   NULL}
+ };
+ 
+@@ -416,11 +432,13 @@
+         auxiliar_setclass(L, "udp{unconnected}", -1);
+         /* initialize remaining structure fields */
+         socket_setnonblocking(&sock);
++#ifdef IPV6_V6ONLY
+         if (family == PF_INET6) {
+             int yes = 1;
+             setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
+                 (void *)&yes, sizeof(yes));
+         }
++#endif
+         udp->sock = sock;
+         timeout_init(&udp->tm, -1, -1);
+         udp->family = family;
+