Log Message:
Update security/py-backports.ssl_match_hostname to 3.5.0.1.

pkgsrc changes:
* Switch to distutils.mk in order to avoid installation error in the install
  phase (``error: option --single-version-externally-managed not recognized''
  ref. to setup.py). No functional changes intended.
* Use MASTER_SITE_PYPI instead of hard-coding the entire pypi.python.org URL.

Changes:
* It was updated in python-3.5 to handle IPAddresses in ServerAltName fields
  (something that backports.ssl_match_hostname will do if you also install the
  ipaddress library from pypi).