Log Message:
Update squid pacakge to 2.6.13 (2.6.STABLE13).

Changes to squid-2.6.STABLE13 (11 May 2007)

	- Make sure reply headers gets sent even if there is no body available
	  yet, fixing RealMedia streaming over HTTP issues.
	- Undo an accidental name change of storeUnregisterAbort.
	- Kill an ancient malplaced storeUnregisterAbort call from ftp.c
	- Bug #1814: SSL memory leak on persistent SSL connections
	- Don't log ECONNREFUSED/ECONNABORTED accept failures in cache.log
	- Cosmetic fix: added missing newline in WCCPv2 configuration dump.
	- Ukrainan error messages
	- Convert various error pages from DOS to UNIX text format
	- Bug #1820: COSS assertion failure t->length == MD5_DIGEST_CHARS
	- Clarify the max-conn=n cache_peer option syntax slightly
	- Bug #1892: COSS segfault on shutdown
	- Windows port: fix undefined ECONNABORTED
	- Make refreshIsCachable handle ETag as a cache validator, not
	  only last-modified
	- in_port_t is not portable, use unsigned short instead
	- Fix fs / auth / snmp dependencies
	- Portability: statfs() may reqire #include <sys/statfs.h>