www/squid: 3.5.16 -> 3.5.17

Changes:

http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID_3_5_17.html
http://www.squid-cache.org/Advisories/SQUID-2016_5.txt

PR: 208939
Submitted by: Pavel Timofeev <timp87@gmail.com> (maintainer)
MFH: 2016Q2
Security: CVE-2016-4052, CVE-2016-4053, CVE-2016-4054