package/kmscube: Use the official gitlab URL

The cgit URL is a mirror of the gitlab repository.

The README.md file of the kmscube project also points
to the gitlab repository, so switch the URL accordingly.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/kmscube/Config.in

@@ -6,4 +6,4 @@ config BR2_PACKAGE_KMSCUBE
 	help
 	  kmscube is an application to test kms/drm drivers.
 
-	  https://cgit.freedesktop.org/mesa/kmscube/
+	  https://gitlab.freedesktop.org/mesa/kmscube