screen-cast: Add vmwgfx to the DMA buffer deny list

VMWare has the same issues with mmap():ing DMA buffers cross process
boundaries so fall back to regular shared memory for 'vmwgfx' as well.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1318

src/backends/native/meta-backend-native.c

@@ -354,6 +354,7 @@ maybe_disable_screen_cast_dma_bufs (MetaBackendNative *native)
   const char *driver_name;
   static const char *disable_dma_buf_drivers[] = {
     "qxl",
+    "vmwgfx",
     NULL,
   };