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

Merge commit '18c5bcc66a9a7b2178dcdcf04a0716958798ab81' into gingerbread-plus-aosp

* commit '18c5bcc66a9a7b2178dcdcf04a0716958798ab81':
  Revert "Set SA_RESTORER in sigaction()"