Fix ssl module compilation if ECDH support was disabled in the OpenSSL build.
(followup to issue #13627)
diff --git a/Lib/ssl.py b/Lib/ssl.py
index 0b2f743..d43d255 100644
--- a/Lib/ssl.py
+++ b/Lib/ssl.py
@@ -86,7 +86,7 @@
     SSL_ERROR_EOF,
     SSL_ERROR_INVALID_ERROR_CODE,
     )
-from _ssl import HAS_SNI
+from _ssl import HAS_SNI, HAS_ECDH
 from _ssl import (PROTOCOL_SSLv3, PROTOCOL_SSLv23,
                   PROTOCOL_TLSv1)
 from _ssl import _OPENSSL_API_VERSION