uapi: fix linux/mroute.h userspace compilation errors

Include <linux/in.h> to fix the following linux/mroute.h userspace
compilation errors:

/usr/include/linux/mroute.h:58:18: error: field 'vifc_lcl_addr' has incomplete type
  struct in_addr vifc_lcl_addr;     /* Local interface address */
/usr/include/linux/mroute.h:61:17: error: field 'vifc_rmt_addr' has incomplete type
  struct in_addr vifc_rmt_addr; /* IPIP tunnel addr */
/usr/include/linux/mroute.h:72:17: error: field 'mfcc_origin' has incomplete type
  struct in_addr mfcc_origin;  /* Origin of mcast */
/usr/include/linux/mroute.h:73:17: error: field 'mfcc_mcastgrp' has incomplete type
  struct in_addr mfcc_mcastgrp;  /* Group in question */
/usr/include/linux/mroute.h:84:17: error: field 'src' has incomplete type
  struct in_addr src;
/usr/include/linux/mroute.h:85:17: error: field 'grp' has incomplete type
  struct in_addr grp;
/usr/include/linux/mroute.h:109:17: error: field 'im_src' has incomplete type
  struct in_addr im_src,im_dst;
/usr/include/linux/mroute.h:109:24: error: field 'im_dst' has incomplete type
  struct in_addr im_src,im_dst;

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/mroute.h

@@ -3,6 +3,7 @@
 
 #include <linux/sockios.h>
 #include <linux/types.h>
+#include <linux/in.h>		/* For struct in_addr. */
 
 /* Based on the MROUTING 3.5 defines primarily to keep
  * source compatibility with BSD.