Add GYP file for tools\windows\symupload.

This creates a GYP project file for the Windows symupload binary, allowing for
easier building. It also updates the old VC 8.0 project file to reflect recent
changes to PdbSourceLineWriter.

Review URL: https://breakpad.appspot.com/579002/



git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1168 4c0a9323-5329-0410-9bdc-e9ce6186880e