Update privoxy to 3.0.12
This is a stable release which includes many enhancements but no major
new features. The most prominent improvement is support for keep-alive
connections.

Also add a patch to deal with non-availability of gethostbyname_r()
on NetBSD -- privoxy then uses gethostbyname() in a mutexed section,
effectively single threading DNS lookup. This is extremely annoying when
running into DNS timeouts. Hack around it by implementing functionality
using getaddrinfo().

(mjl)