kevans 0cae8c4a40 Add sigsetop extensions commonly found in musl libc and glibc
These functions (sigandset, sigisemptyset, sigorset) are commonly available
in at least musl libc and glibc; sigorset, at least, has proven quite useful
in qemu-bsd-user work for tracking the current process signal mask in a more
self-documenting/aesthetically pleasing manner.

Reviewed by:	bapt, jilles, pfg
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D22187
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