[3.15] gh-158091: Check only the file name for _d in test_dll_dependency_import (GH-158099) (#158108)

Co-authored-by: Lazizbek Ergashev <lazerg2@gmail.com>

Author: miss-islington

Lib/test/test_import/__init__.py

@@ -787,7 +787,7 @@ def test_dll_dependency_import(self):
         pydname = importlib.util.find_spec("_sqlite3").origin
         depname = os.path.join(
             os.path.dirname(pydname),
-            "sqlite3{}.dll".format("_d" if "_d" in pydname else ""))
+            "sqlite3{}.dll".format("_d" if "_d" in os.path.basename(pydname) else ""))
 
         with os_helper.temp_dir() as tmp:
             tmp2 = os.path.join(tmp, "DLLs")