[Feature Request] Consider adding a feature flag for enhanced determinism option of glam

[Ughuuu]

Consider adding option:

enchanced-determinism = ["glam/libm"]

For glam inside godot-core/Cargo.toml. This option would allow people that want to use the libm flag which would make the math lib cross platform determinism at the expense of speed be able to do so without needing to fork gdext.