[client] wayland: make waitFrame work when not rendering

Implement skipFrame and do various things to wake waitFrame.

client/displayservers/Wayland/shell_xdg.c

@@ -47,6 +47,7 @@ static void xdgSurfaceConfigure(void * data, struct xdg_surface * xdgSurface,
     wlWm.needsResize  = true;
     wlWm.resizeSerial = serial;
     app_invalidateWindow();
+    waylandForceRender();
   }
   else
   {