[Bug 208906] www/squid: Fix "varyEvaluateMatch: Oops. Not a Vary match on second attempt" messages after 3.5.16

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208906

            Bug ID: 208906
           Summary: www/squid: Fix "varyEvaluateMatch: Oops. Not a Vary
                    match on second attempt" messages after 3.5.16
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: timp87 at gmail.com
             Flags: maintainer-feedback?(timp87 at gmail.com)
                CC: timp87 at gmail.com

Created attachment 169453
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169453&action=edit
Fix squid "varyEvaluateMatch: Oops. Not a Vary match on second attempt"
messages (bug 4481)

After the recent upgrade of www/squid to 3.5.16, it started spamming cache.log
with messages like:

2016/04/17 17:38:58 kid1| varyEvaluateMatch: Oops. Not a Vary match on second
attempt, 'http://www.theregister.co.uk/Design/graphics/ico
n/linkedin.svg' 'accept-encoding="gzip,%20deflate"'
2016/04/17 17:38:58 kid1| clientProcessHit: Vary object loop!
2016/04/17 17:38:58 kid1| varyEvaluateMatch: Oops. Not a Vary match on second
attempt, 'http://www.theregister.co.uk/Design/graphics/ico
n/google_plus.svg' 'accept-encoding="gzip,%20deflate"'
2016/04/17 17:38:58 kid1| clientProcessHit: Vary object loop!
2016/04/17 17:38:58 kid1| varyEvaluateMatch: Oops. Not a Vary match on second
attempt, 'http://www.theregister.co.uk/Design/graphics/ico
ns/reg_logo.svg' 'accept-encoding="gzip,%20deflate"'
2016/04/17 17:38:58 kid1| clientProcessHit: Vary object loop!

This was apparently caused by a Vary patch included in 3.5.16.  The upstream
bug is here: http://bugs.squid-cache.org/show_bug.cgi?id=4481

The patch touches two files, and is adapted from
http://bazaar.launchpad.net/~squid/squid/3.5/revision/14022

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