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

* commit 'fa36875df423af968d053c584c0de18a2448516b':
  Make strerror(3) and strsignal(3) thread-safe, and add psignal(3) and psiginfo(3).