Using `EM_ASM` here would cause this error in template builds:
```
EM_ASM is not supported in side modules
```
We use our own method for this since it already handles this properly.
Since Embree v3.13.0 supports AARCH64, switch back to the
official repo instead of using Embree-aarch64.
`thirdparty/embree/patches/godot-changes.patch` should now contain
an accurate diff of the changes done to the library.
