Use _Static_assert
Use _Static_assert

Both GCC and clang already supports C11's _Static_assert, so use it
instead of defining our own macro.

Distrotech/kmod,pmmccorm/kmod,lpereira/kmod,lpereira/kmod,Distrotech/kmod,pmmccorm/kmod,lpereira/kmod,lucasdemarchi/kmod,lucasdemarchi/kmod,Distrotech/kmod,lucasdemarchi/kmod,pmmccorm/kmod