Reviewed by Tor Arne Vestbø

        Unify determineQuirks between the Qt and the Gtk PluginPackage.
        Share the code for parsing the module version from the description.
        This is currently used to determine Flash based quirks.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38123 268f45cc-cd09-0410-ab3c-d52691b4dbfc