wayland-server: Remove unused members from struct wl_client

Those struct members are no longer used so we can remove them.

Signed-off-by: Sergi Granell <xerpi.g.12@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/src/wayland-server.c b/src/wayland-server.c
index 6a8b3e4..82a3b01 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -74,8 +74,6 @@
 	struct wl_event_source *source;
 	struct wl_display *display;
 	struct wl_resource *display_resource;
-	uint32_t id_count;
-	uint32_t mask;
 	struct wl_list link;
 	struct wl_map objects;
 	struct wl_priv_signal destroy_signal;