libc: move rfork_thread(3) to libsys

rfork_thread(3) is assembly that makes syscalls directly and uses
cerror so it belongs in libsys.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com

libc: move rfork_thread(3) to libsys

rfork_thread(3) is assembly that makes syscalls directly and uses
cerror so it belongs in libsys.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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