Issue #27322: skip test_compile_path when sys.path is not writeable.

Lib/test/test_compileall.py

@@ -105,6 +105,7 @@ class CompileallTests(unittest.TestCase):
     def test_compile_path(self):
         # Exclude Lib/test/ which contains invalid Python files like
         # Lib/test/badsyntax_pep3120.py
+        self._skip_if_sys_path_not_writable()
         testdir = os.path.realpath(os.path.dirname(__file__))
         if testdir in sys.path:
             self.addCleanup(setattr, sys, 'path', sys.path)