Update to OpenXR 1.0.12

[Ralith]

No description provided.

[Ralith]

@Jake-Shadle can you advise on whether we can come up with something safer than *mut c_void for the LoaderInitInfoAndroidKHR builder's parameters?

[Jake-Shadle]

I don't know I'm not really familiar with the code in this repo or in the native openxr library, can it not be type aliased like the other c_void types? It could also be done as an opaque struct if it's just used as an opaque pointer from the native side.

[Ralith]

Upstream OpenXR just refers to them as void*, which is what this PR exposes in the -sys API. I'd like to also have safe high-level bindings, but I don't have any context for Android to know if that's possible. I'll probably just blacklist them from the high-level bindings for now.

[Jake-Shadle]

That seems reasonable, if someone actually needs it it can always be added later. 🙂