Fix 64-bit build on Linux.
Fix 64-bit build on Linux.

BUG=412
Review URL: http://breakpad.appspot.com/233001

git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@734 4c0a9323-5329-0410-9bdc-e9ce6186880e

AlekSi/google-breakpad-mirror,albertz/google-breakpad,AlekSi/google-breakpad-mirror,albertz/google-breakpad,AlekSi/google-breakpad-mirror,albertz/google-breakpad,AlekSi/google-breakpad-mirror,albertz/google-breakpad,albertz/google-breakpad,AlekSi/google-breakpad-mirror,albertz/google-breakpad