Fix build on some platforms by adding extra flags
Fix build on some platforms by adding extra flags

For some reason all the necessary CFALGS are not returned by simply
querying the CFLAGS from apxs. We also need to query EXTRA_CPPFLAGS
apparently.

uhd-urz/mod_auth_gssapi,devurandom/mod_auth_gssapi,frenche/mod_auth_gssapi,davisd123/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,devurandom/mod_auth_gssapi,frenche/mod_auth_gssapi,davisd123/mod_auth_gssapi,frenche/mod_auth_gssapi,devurandom/mod_auth_gssapi,davisd123/mod_auth_gssapi,frenche/mod_auth_gssapi