Bug#1130159: godot: Consider enabling openxr support

[Travis Wrightsman]

> I would guess this is a version mismatch. Debian has openxr 1.1.47
> while in Godot sources there is at modules/openxr version 1.1.49:

Just wanted to confirm that I tracked these symbols down and they were
indeed introduced in OpenXR version 1.1.49.

So to enable OpenXR support in Godot 4.6.3 (upload coming) Debian would
need to bump openxr-sdk-source.