Log Message:
Updated www/varnish to 2.0.6.

2.0.6:
- Fix off-by-one error in ESI handling
- Bug fixes related to session lingering
- Backend probes should now work correctly with more servers
- Portability fixes
- Make it possible to specify the per-thread stack size, useful for 32 bit
  systems

2.0.5:
- Performance improvements, particularly on Linux.
- Implement support for HTTP continuation lines
- Handle illegal responses from the backend better by serving a 503 page
  rather than panic-ing
- Add backtrace to assertion errors. This requires Varnish to be installed
  unstripped
- Consume less memory when processing ESI
- Better standards compliance with If-None-Match support and emitting more
  headers on 304 responses
- Add a FetchError? log tag which makes it easier to understand why a
  backend fetch failed.

pkgsrc changes:
- Proper EGDIR/SYSCONFDIR support.
- Default user, directory, ownership and permissions support.
- Rudimentary fix for gcc vs. sunpro on Solaris, as used by varnish
  to compile config files.