Log Message:
Update tor to 0.2.1.19.
Based on maintainer update request via PR 41828.
(remove patch-a{a,b} and make to simplify by me).

Tor 0.2.1.18 lays the foundations for performance improvements, adds
status events to help users diagnose bootstrap problems, adds optional
authentication/authorization for hidden services, fixes a variety of
potential anonymity problems, and includes a huge pile of other features
and bug fixes.

Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
services.