www/squid: Fixes security vulnerabilities

Add patches to fix CVE's:

CVE-2018-1000024
CVE-2018-1000027

PR: 226139
Submitted by: Yasuhiro KIMURA <yasu@utahime.org>
Approved by: timp87@gmail.com (maintainer)
MFH: 2018Q1
Security: d5b6d151-1887-11e8-94f7-9c5c8e75236a