security/py-backports.ssl_match_hostname: set for deprecation

Mark as deprecated. Function match_hostname() was backported
to standard library (ssl module) since Python 2.7.9. This is
the python version we have in ports, so there is no need in
this port anymore. Set expiration date to 2015-04-08.

References:

• https://docs.python.org/2.7/library/ssl.html