am de9db8f7: am fa36875d: Merge "Make strerror(3) and strsignal(3) thread-safe, and add psignal(3) and psiginfo(3)."

* commit 'de9db8f7efb10cdab1c81f1d3164f3b55e5f08e9':
  Make strerror(3) and strsignal(3) thread-safe, and add psignal(3) and psiginfo(3).