Patch by Torsten Schoenfeld for allowing the usage and test of
	Gtk2::SourceView::StyleScheme.

	* t/GtkSourceStyleScheme.t:
	* t/GtkSourceLanguage.t: test whether the style scheme stuff works.

	* xs/GtkSourceStyleScheme.xs: Gtk2::SourceView::StyleScheme work by
	sub-classing it inside the various languages, so let's not complain
	for its children.

	* Makefile.PL: require GLib 1.103 for the new lazy package mapping.

svn path=/trunk/; revision=20