zink: set dma-buf bit for shared resources

Set the dma-buf bit when supported.  This is done because
zink_resource_get_handle exports dma-bufs when WINSYS_HANDLE_TYPE_FD is
requested.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14872>

src/gallium/drivers/zink/zink_resource.c

@@ -503,6 +503,10 @@ resource_object_create(struct zink_screen *screen, const struct pipe_resource *t
       }
    }
 
+   /* we may export WINSYS_HANDLE_TYPE_FD handle which is dma-buf */
+   if (shared && screen->info.have_EXT_external_memory_dma_buf)
+      export_types |= VK_EXTERNAL_MEMORY_HANDLE_TYPE_DMA_BUF_BIT_EXT;
+
    /* TODO: remove linear for wsi */
    bool scanout = templ->bind & PIPE_BIND_SCANOUT;