Merge the sigaction() and sigprocmask() overloads/wrappers from libpthread
into libc, and move pthread_sigmask() as well (just a trivial wrapper).
This provides consistent handling of SIGTHR between

Merge the sigaction() and sigprocmask() overloads/wrappers from libpthread
into libc, and move pthread_sigmask() as well (just a trivial wrapper).
This provides consistent handling of SIGTHR between single- and multi-threaded
programs and is a step in the merge of all the libpthread overloads, providing
some ASM and Makefile bits that the other wrappers will need.

ok deraadt@ millert@

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zap rcsid.
okay deraadt@ (tested them all)

_THREAD_SAFE; nominal testing by fries

Merge to NetBSD, added RCSids

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

initial import of NetBSD tree