Log Message:
Update squid3 to 3.5.2 (Squid 3.5.3).

Changes to squid-3.5.2 (18 Feb 2015):

	- Regression Bug 4176: Digest auth too many helper lookups
	- Regression Bug 4180: not-fully-initialized data member in ACLUserData
	- Bug 4172: Solaris broken krb5-config
	- Bug 4073: Cygwin compile errors
	- Bug 3919: remove several never-true / never-false comparisons
	- HTTPS: Add missing root CAs when validating chains that passed internal checks
	- Fix some cbdataFree related memory leaks
	- Quieten CBDATA 'leak' messages
	- Set SNI information in transparent bumping mode
	- negotiate_kerberos_auth: fix krb5.conf backward compatibility
	- Fix memory leaks in cachemgr.cgi URL parser
	- Fix sslproxy_options in peek-and-splice mode
	- ... and fix several portability and build issues
	- ... and some documentation updates
	- ... and all fixes from squid 3.4.11