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* Merge the sigaction() and sigprocmask() overloads/wrappers from libpthreadguenther2015-10-231-0/+41
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@