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test_importlib fails when _testcapi is a builtin module #94217

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Some test_importlib cases for extension modules are failing when Python is compiled with dynamic extension support but _testcapi or _testmultiphase are builtin modules:

====================================================================== FAIL: test_module (test.test_importlib.extension.test_finder.Frozen_FinderTests.test_module) ---------------------------------------------------------------------- Traceback (most recent call last): File "/python-wasm/cpython/Lib/test/test_importlib/extension/test_finder.py", line 25, in test_module self.assertTrue(self.find_spec(util.EXTENSIONS.name)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AssertionError: None is not true

The tests should be skipped if the module name is in sys.builtin_module_names.

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3.11only security fixes3.12only security fixestopic-importlibtype-bugAn unexpected behavior, bug, or error

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