Skip test on PyPy where the functionality is disabled.

distutils/tests/test_sysconfig.py

@@ -45,6 +45,7 @@ class SysconfigTestCase(support.EnvironGuard, unittest.TestCase):
         self.assertIsInstance(cvars, dict)
         self.assertTrue(cvars)
 
+    @unittest.skip('sysconfig.IS_PYPY')
     def test_srcdir(self):
         # See Issues #15322, #15364.
         srcdir = sysconfig.get_config_var('srcdir')