evas waylang_egl: flag on msaa to optimize map drawing.

This msaa flag could help map drawing by avoiding unnecessary framebuffer mapping.

src/modules/evas/engines/wayland_egl/evas_wl_main.c

@@ -212,6 +212,7 @@ try_again:
      }
    if (w && h)
      eng_window_resurf(gw);
+   gw->gl_context->msaa = (Eina_Bool) gw->msaa_bits;
    return gw;
 }