hgweb: let HTTPS serve use more compatible and less secure encryption

PROTOCOL_SSLv3 on the server side doesn't work everywhere. Sometimes the client
reports "EOF occurred in violation of protocol" (for example on Mac and Solaris).

The more compatible PROTOCOL_SSLv23 is now used instead. It works but is less
"secure" for some OpenSSL versions as it can fall back to weak encryption.

mercurial/hgweb/server.py

@@ -227,7 +227,7 b' class _httprequesthandlerssl(_httpreques'
         except ImportError:
             raise util.Abort(_("SSL support is unavailable"))
         httpserver.socket = ssl.wrap_socket(httpserver.socket, server_side=True,
-            certfile=ssl_cert, ssl_version=ssl.PROTOCOL_SSLv3)
+            certfile=ssl_cert, ssl_version=ssl.PROTOCOL_SSLv23)
 
     def setup(self):
         self.connection = self.request