Fix arm64/Windows build.

[bruvzg]

• Fixes typo in the PNG driver SCsub
• Disables unsupported raycast/embree for arm64/Windows.

[akien-mga]

Thanks!

[akien-mga]

Might be worth checking if some of these changes are needed for 3.x too. I suspect at least the raycast one, but there might be more.

[aaronfranke]

Note: We can re-enable Embree if we apply this patch: RenderKit/embree#483

I did not submit it here yet because I was hoping it would be accepted by upstream in a timely manner.

[akien-mga]

Looks pretty good to me. I think we can include it downstream, together with a patch file in thirdparty/embree/patches/ that documents the downstream changes.

[aaronfranke]

Here's a branch with a patch file: https://github.com/aaronfranke/godot/tree/embree-win-arm64-msvc

Unfortunately it fails linking, I'm not sure what to do to fix it. @bruvzg Want to take a look?

[bruvzg]

Unfortunately it fails linking, I'm not sure what to do to fix it.

I'll check it.

[bruvzg]

Note: We can re-enable Embree if we apply this patch

I do not think it will work. USE_SOFT_INTRINSICS seems to only do something if you use softintrin.h (or generic intrin.h) instead of *mmintrin.h, and it does not have all required stuff implemented.