gi: use g_type_tag_to_string() instead of hand-coded thing
gi: use g_type_tag_to_string() instead of hand-coded thing

	* gi/arg.c (gjs_value_to_g_arg_with_type_info,
	gjs_value_from_g_arg, gjs_g_arg_release): use
	g_type_tag_to_string() from girepo instead of hand-coded thing

svn path=/trunk/; revision=9

pixunil/cjs,mtwebster/cjs,pixunil/cjs,pixunil/cjs,endlessm/gjs,mtwebster/cjs,magcius/gjs,endlessm/gjs,magcius/gjs,djdeath/gjs,djdeath/gjs,endlessm/gjs,endlessm/gjs,djdeath/gjs,pixunil/cjs,mtwebster/cjs,joeshaw/gjs,joeshaw/gjs,mtwebster/cjs,joeshaw/gjs,pixunil/cjs,mtwebster/cjs,endlessm/gjs,joeshaw/gjs,djdeath/gjs,magcius/gjs,magcius/gjs,magcius/gjs,joeshaw/gjs,djdeath/gjs