gnome: move introspection options to gnomebase

The gnome class is really a convenience class to include other classes, so move
the introspection arguments into gnomebase.bbclass.

(From OE-Core rev: b43a1b244a5ceab52713759dc53b00b162d9d43f)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/gnome.bbclass

@@ -1,5 +1 @@
 inherit gnomebase gtk-icon-cache gconf mime
-
-EXTRA_OECONF += "--disable-introspection"
-
-UNKNOWN_CONFIGURE_WHITELIST += "--disable-introspection"

meta/classes/gnomebase.bbclass

@@ -28,3 +28,6 @@ do_install_append() {
 	rm -f ${D}${datadir}/applications/*.cache
 }
 
+EXTRA_OECONF += "--disable-introspection"
+
+UNKNOWN_CONFIGURE_WHITELIST += "--disable-introspection"