python
gh-143304: Fix ctypes.CDLL to honor handle parameter on POSIX systems
The handle parameter was being ignored in the POSIX implementation of CDLL._load_library(), causing it to always call _dlopen() even when a valid handle was provided. This was a regression introduced in recent refactoring.
This PR adds the missing handle check to match the Windows implementation behavior, and includes a regression test.
Fixes gh-143304
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