Log Message:
Update squid3 to 3.5.19, 3.5.18 contains security fix.

Changes to squid-3.5.19 (09 May 2016):

	- Regression Bug 4515: interception proxy hangs

Changes to squid-3.5.18 (06 May 2016):

	- Bug 4510: stale comment about 32KB limit on shared memory cache entries
	- Bug 4509: EUI compile error on NetBSD
	- Bug 4501: HTTP/1.1: normalize Host header
	- Bug 4498: URL-unescape the login-info after extraction from URI
	- Bug 4455: SegFault from ESIInclude::Start
	- Prevent Squid forcing -b 2048 into the arguments for sslcrtd_program
	- Fix TLS/SSL server handshake alert handling