kern_sig.c: Move SIG_FOREACH into signalvar.h

[jfree]

Summary

Make the SIG_FOREACH macro accessible outside of kern_sig.c by moving
it into signalvar.h next to the other sigset_t macros.

[markj]

sys/sys/signalvar.h

154

Presumably you intend to use this elsewhere in the kernel, and not in userspace? If so, these definitions should go into the #ifdef _KERNEL block below: we don't want to inadvertently put new stuff in the userland-visible namespace.

[jfree]

sys/sys/signalvar.h

154

Hm. I was under the impression that everything in this file was stricly for the kernel because it includes the ksiginfo declaration and macros.

I'll move this one into an ifdef _KERNEL, though. Thanks for pointing that out.

[jfree]

Move SIG_FOREACH() into an #ifdef _KERNEL.