configure: fix win32 build

Only require -lresolv on unix, like before

https://bugzilla.gnome.org/show_bug.cgi?id=645336

configure.ac

@@ -1072,6 +1072,7 @@ AC_CHECK_FUNCS(getprotobyname_r endservent)
 AC_CHECK_HEADERS([netdb.h wspiapi.h arpa/nameser_compat.h])
 
 # For gio/libasyncns
+if test $glib_native_win32 = no; then
   AC_CHECK_FUNCS(strndup setresuid setreuid)
   AC_CHECK_HEADERS(sys/prctl.h)
 
@@ -1105,6 +1106,7 @@ AC_TRY_LINK([#include <sys/types.h>
   AC_CHECK_FUNC(socket, :, AC_CHECK_LIB(socket, socket,
 				        [NETWORK_LIBS="-lsocket $NETWORK_LIBS"],
 				        [AC_MSG_ERROR(Could not find socket())]))
+fi
 AC_SUBST(NETWORK_LIBS)
 
 case $host in