gh-157763: Fix ctypes.util.test() on Windows

[lazerg]

The Windows branch of ctypes.util.test() calls cdll.load("msvcrt"), but LibraryLoader has no load method, so the call ends up in __getattr__ and raises AttributeError: load.

Use LoadLibrary, which is what every other branch of the same function already does.

• Issue: ctypes.util.test() calls cdll.load, which LibraryLoader does not have #157763

[ZeroIntensity]

This function is untested, hardly used, and doesn't seem particularly useful to anyone. I think we should just soft-deprecate it rather than take on maintenance.

[bedevere-app]

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[lazerg]

Closing in favor of #157776. Removing the function is better than fixing the call in it.