[Bug c/71152] NULL is not cast to (void *) as it ought to be if compiling code with -c

[rstrode at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71152

--- Comment #2 from Ray Strode <rstrode at redhat dot com> ---
this test case works as expected with gcc-5.3.1-6.fc23.x86_64