wayland: Use xdg shell protocol from wayland-protocols

Drop our own copy of the xdg shell XML file, and use the one installed
by wayland-protocols.

https://bugzilla.gnome.org/show_bug.cgi?id=758634

gdk/wayland/Makefile.am

@@ -22,8 +22,8 @@ noinst_LTLIBRARIES =				\
 BUILT_SOURCES = 				\
 	pointer-gestures-unstable-v1-client-protocol.h		\
 	pointer-gestures-unstable-v1-protocol.c			\
-	xdg-shell-client-protocol.h		\
-	xdg-shell-protocol.c			\
+	xdg-shell-unstable-v5-client-protocol.h			\
+	xdg-shell-unstable-v5-protocol.c			\
 	gtk-shell-client-protocol.h		\
 	gtk-shell-protocol.c
 
@@ -88,7 +88,6 @@ endef
 	$(AM_V_GEN)$(WAYLAND_SCANNER) client-header < $< > $@
 
 EXTRA_DIST += 					\
-	protocol/xdg-shell.xml			\
 	protocol/gtk-shell.xml
 
 -include $(top_srcdir)/git.mk

gdk/wayland/gdkdisplay-wayland.h

@@ -28,7 +28,7 @@
 #include <wayland-cursor.h>
 #include <wayland-egl.h>
 #include <gdk/wayland/gtk-shell-client-protocol.h>
-#include <gdk/wayland/xdg-shell-client-protocol.h>
+#include <gdk/wayland/xdg-shell-unstable-v5-client-protocol.h>
 
 #include <glib.h>
 #include <gdk/gdkkeys.h>