Attempt to fix the issue for 10.x, 11.x and head on i386.

networking.o: In function `createClient':
networking.c:(.text+0x189): undefined reference to `__atomic_fetch_add_8'
cc: error: linker command failed with exit code 1 (use -v to see invocation)

Do not bump PORTREVISION since this change affects i386 only what's broken till now.