don't require OpenSSL SNI to pass hostname to ssl functions (#22921)

Patch by Donald Stufft.
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index ad104fe..72ab5d7 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -745,9 +745,8 @@
             ssl_context = ssl._create_stdlib_context()
         typ, dat = self._simple_command(name)
         if typ == 'OK':
-            server_hostname = self.host if ssl.HAS_SNI else None
             self.sock = ssl_context.wrap_socket(self.sock,
-                                                server_hostname=server_hostname)
+                                                server_hostname=self.host)
             self.file = self.sock.makefile('rb')
             self._tls_established = True
             self._get_capabilities()
@@ -1223,9 +1222,8 @@
 
         def _create_socket(self):
             sock = IMAP4._create_socket(self)
-            server_hostname = self.host if ssl.HAS_SNI else None
             return self.ssl_context.wrap_socket(sock,
-                                                server_hostname=server_hostname)
+                                                server_hostname=self.host)
 
         def open(self, host='', port=IMAP4_SSL_PORT):
             """Setup connection to remote server on "host:port".