Fix codes on Windows

Author: aisk

Lib/multiprocessing/shared_memory.py

@@ -254,7 +254,7 @@ def unlink(self):
             if self._track:
                 resource_tracker.unregister(self._name, "shared_memory")
 
-    if hasattr(_posixshmem, "shm_rename"):
+    if _USE_POSIX and hasattr(_posixshmem, "shm_rename"):
         def rename(self, newname, flags=0):
             """Renames a shared memory block.
 

Lib/test/_test_multiprocessing.py

@@ -4376,7 +4376,7 @@ def test_shared_memory_recreate(self):
             self.addCleanup(shm2.unlink)
             self.assertEqual(shm2._name, names[1])
 
-    @unittest.skipUnless(HAS_SHMEM and hasattr(shared_memory, "rename"),
+    @unittest.skipUnless(hasattr(shared_memory, "rename"),
                          "requires SharedMomery.rename")
     def test_shared_memory_rename(self):
         name1 = self._new_shm_name('testrename01_tsmb')