Use PROTOCOL_SSLv23 in the test HTTPS server, in an attempt to appease the old Gentoo buildbot

Lib/test/ssl_servers.py

@@ -141,7 +141,7 @@ class HTTPSServerThread(threading.Thread):
 
 def make_https_server(case, certfile=CERTFILE, host=HOST, handler_class=None):
     # we assume the certfile contains both private key and certificate
-    context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
+    context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
     context.load_cert_chain(certfile)
     server = HTTPSServerThread(context, host, handler_class)
     flag = threading.Event()