clients/simple-shm: Port to xdg_shell unstable v6

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Acked-by: Bryce Harrington <bryce@osg.samsung.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
diff --git a/Makefile.am b/Makefile.am
index a5b0536..a0b2be6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -521,8 +521,8 @@
 
 weston_simple_shm_SOURCES = clients/simple-shm.c
 nodist_weston_simple_shm_SOURCES =		\
-	protocol/xdg-shell-unstable-v5-protocol.c		\
-	protocol/xdg-shell-unstable-v5-client-protocol.h	\
+	protocol/xdg-shell-unstable-v6-protocol.c		\
+	protocol/xdg-shell-unstable-v6-client-protocol.h	\
 	protocol/fullscreen-shell-unstable-v1-protocol.c	\
 	protocol/fullscreen-shell-unstable-v1-client-protocol.h	\
 	protocol/ivi-application-protocol.c		\