Remove unused variable if Python is build without threads

Python/import.c

@@ -2349,7 +2349,9 @@ PyImport_ImportModuleNoBlock(const char *name)
 {
     PyObject *result;
     PyObject *modules;
+#ifdef WITH_THREAD
     long me;
+#endif
 
     /* Try to get the module from sys.modules[name] */
     modules = PyImport_GetModuleDict();