nommu: fix building of fork.c when stubs are disabled
nommu: fix building of fork.c when stubs are disabled

We scrub the fork() prototype for nommu/no stubs, so attempting to get
its type isn't going to work.

Signed-off-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@gentoo.org>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc