With eglibc needs to define -D_GNU_SOURCE in cflags to avoid following error:

With eglibc needs to define -D_GNU_SOURCE in cflags to avoid following error:

  CC      build-mips/sa/pton.o
src/sa/pton.c: In function 'net_inet_pton':
src/sa/pton.c:233:7: error: 'const struct in6_addr' has no member named 's6_addr32'
src/sa/pton.c:233:7: error: 'const struct in6_addr' has no member named 's6_addr32'
src/sa/pton.c:233:7: error: 'const struct in6_addr' has no member named 's6_addr32'

Signed-off-by: Mika Laitio <mika.laitio@nokia.com>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@33008 3c298f89-4303-0410-b956-a3cf2f4a3e73