package/pppd: requires DES support in openssl

Enable DES in openssl to fix build failure raised since commit
a83d41867c8d69a77d5cd0a665aa216af5340359

Fixes:
 - http://autobuild.buildroot.org/results/3cd38e6dfd5f94f0bd1689e7db4ea1d723dd2a80

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr: only select it for glibc toolchains]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/pppd/Config.in

@@ -4,6 +4,8 @@ config BR2_PACKAGE_PPPD
 	depends on !BR2_TOOLCHAIN_USES_MUSL # Use __P() macro all over the tree
 	depends on BR2_USE_MMU
 	select BR2_PACKAGE_OPENSSL if BR2_TOOLCHAIN_USES_GLIBC
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES if BR2_PACKAGE_LIBOPENSSL \
+						 && BR2_TOOLCHAIN_USES_GLIBC
 	help
 	  An implementation of the Point-to-point protocol.