window: send transient flags over the wire

Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
diff --git a/clients/window.h b/clients/window.h
index bcb7d62..162cc34 100644
--- a/clients/window.h
+++ b/clients/window.h
@@ -197,7 +197,7 @@
 window_create(struct display *display);
 struct window *
 window_create_transient(struct display *display, struct window *parent,
-			int32_t x, int32_t y);
+			int32_t x, int32_t y, uint32_t flags);
 
 typedef void (*menu_func_t)(struct window *window, int index, void *data);