www/py-wsaccel: Update version 0.6.4=>0.6.6

• Mark DEPRECATED without EXPIRATION_DATE as there are lots of consumers
• Upstream has ceased development with the following note: "AutobahnPython and ws4py are not actively maintained. So I will stop this project too. Please migrate to Tornado or websockets."

Changelog: https://github.com/methane/wsaccel/releases/tag/v0.6.6