Issue #12012: ssl.PROTOCOL_SSLv2 becomes optional

OpenSSL is now compiled with OPENSSL_NO_SSL2 defined (without the SSLv2
protocol) on Debian: fix the ssl module on Debian Testing and Debian Sid.

Optimize also ssl.get_protocol_name(): speed does matter!
diff --git a/Misc/NEWS b/Misc/NEWS
index c780f3d..3b9d27a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -140,6 +140,8 @@
 Library
 -------
 
+- Issue #12012: ssl.PROTOCOL_SSLv2 becomes optional.
+
 - Issue #8407: The signal handler writes the signal number as a single byte
   instead of a nul byte into the wakeup file descriptor. So it is possible to
   wait more than one signal and know which signals were raised.