meson: Add versioning for xvmc tracker

The xvmc tracker used to be versionned with autotool but this seems to have been
lost in the meson switch.

Fixes: 22a817af8a89eb3c762f ("meson: build gallium xvmc state tracker")
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Signed-off-by: Emmanuel Vadot <manu@FreeBSD.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5708>
2 files changed