Close #25367: Fix test_coroutines with no thread support

Skip test_asyncio_1() when the asyncio module cannot be imported because
CPython is compiled with no thread support.

Lib/test/test_coroutines.py

@@ -1322,7 +1322,9 @@ class CoroutineTest(unittest.TestCase):
 class CoroAsyncIOCompatTest(unittest.TestCase):
 
     def test_asyncio_1(self):
-        import asyncio
+        # asyncio cannot be imported when Python is compiled without thread
+        # support
+        support.import_module('asyncio')
 
         class MyException(Exception):
             pass