libs: window: wayland: use dmabuf protocol if available

libs: window: wayland: use dmabuf protocol if available

Currently vaGetSurfaceBufferWl() is used to create wayland buffers.
Unfortunately this is not implemented by the 'media-driver' and Mesa VA-API
drivers. And the implementation provided by 'intel-vaapi-driver' is not
compatible with a Wayland server that uses the iris Mesa driver.

So create the Wayland buffers manually with the zwp_linux_dmabuf_v1 wayland
protocol. Formats and modifiers supported by the Wayland server are taken
into account. If necessary, VPP is enabled to convert the buffer into a
supported format.

Fall back to vaGetSurfaceBufferWl() if creating buffers via dambuf protocol
fails.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/346>