backend-wayland: fix incorrect header

The wayland.c actually include 'xdg-shell-client-protocol.h' instead of
the server one, so fix it. Otherwise, it's possible to get build failure
due to race condition.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Daniel Stone <daniels@collabora.com>
[daniels: Found in OpenEmbedded/Yocto source.]

libweston/backend-wayland/meson.build

@@ -10,7 +10,7 @@ srcs_wlwl = [
 	fullscreen_shell_unstable_v1_protocol_c,
 	presentation_time_protocol_c,
 	presentation_time_server_protocol_h,
-	xdg_shell_server_protocol_h,
+	xdg_shell_client_protocol_h,
 	xdg_shell_protocol_c,
 ]