am 91af9e64: am 18c5bcc6: Revert "Set SA_RESTORER in sigaction()"

Merge commit '91af9e64b5d86dd5925c0fcfdb3f3db5a86aa43c'

* commit '91af9e64b5d86dd5925c0fcfdb3f3db5a86aa43c':
  Revert "Set SA_RESTORER in sigaction()"