make the type system not complain about GdkScreenX11
make the type system not complain about GdkScreenX11

svn path=/trunk/; revision=242

cpanxaoc/perl-Gtk2,potyl/perl-Gtk2,cpanxaoc/perl-Gtk2,potyl/perl-Gtk2,potyl/perl-Gtk2,cpanxaoc/perl-Gtk2