Move libraries shims under src/native

The current directory structure under src/libraries/native is confusing:

The sub-directory names do not match the OSes where the shims are actually building.
The shims are statically linked with the runtime in some configurations

We should consider moving all shims under src/native that seems to be the best place for unmanaged code shared between runtimes.

See #61852 (comment) for full context

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