Avoid setting an alternative stack for signals if there is already one
P=Mike Hommey <mh@glandium.org>
R=ted at http://codereview.appspot.com/5573054/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@918 4c0a9323-5329-0410-9bdc-e9ce6186880e
2 files changed