gh-112984: Fix test_ctypes.test_loading.test_load_dll_with_flags when directory name includes a dot (GH-114217)

Author: zooba

Lib/test/test_ctypes/test_loading.py

@@ -141,7 +141,7 @@ def test_load_hasattr(self):
     def test_load_dll_with_flags(self):
         _sqlite3 = import_helper.import_module("_sqlite3")
         src = _sqlite3.__file__
-        if src.partition(".")[0].lower().endswith("_d"):
+        if os.path.basename(src).partition(".")[0].lower().endswith("_d"):
             ext = "_d.dll"
         else:
             ext = ".dll"