[3.12] gh-126742: Avoid checking for library filename in test_ctypes (GH-128034) (#128057)

gh-126742: Avoid checking for library filename in test_ctypes (GH-128034)

Avoid checking for library filename in `dlerror()` error messages of test_ctypes.
(cherry picked from commit 335e24fb0a5805ac1ecdbc01e0331b38fc33849d)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>