am c9829a2b: am 155a70b9: am de9db8f7: am fa36875d: Merge "Make strerror(3) and strsignal(3) thread-safe, and add psignal(3) and psiginfo(3)."

* commit 'c9829a2b6fb70f2eb0fc6a21f48546c66d9724c7':
  Make strerror(3) and strsignal(3) thread-safe, and add psignal(3) and psiginfo(3).