Log Message:
Update "squid31" package to version 3.1.0.12.
Changes since version 3.1.0.11:
- Bug 2716: Chunked request Signed/Unsigned build error
- Bug 2674: Remove limit on HTTP headers read.
- Bug 2620: Invalid HTTP response codes causes segfault
- Fix FTP EPSV negotiation parser.
- Fix Via string when leak checking is enabled (valgrind etc)
- ... and several documentation and testing additions

This update also fixes the security vulnerabilites reported in
the SQUID-2009:2 advisory.