net/openvswitch: fix build on GCC architectures

Use C11 compiler:
./include/openvswitch/ofp-actions.h:1302: error: bit-field 'build_assert_failed' width not an integer constant
./include/openvswitch/ofp-actions.h:1302: error: bit-field 'build_assert_failed' width not an integer constant
./include/openvswitch/ofp-actions.h:1302: error: bit-field 'build_assert_failed' width not an integer constant

Include sys/socket.h in lib/dns-resolve.c to make AF_INET available.

PR: 241329
Approved by: koue@chaosophia.net (maintainer), linimon (mentor)