test_importlib fails when _testcapi is a builtin module #94217
Description
Bug report
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)
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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.