Changes to squid-4.6 (19 Feb 2019):
- Bug 4915: Detect IPv6 loopback binding errors
- Bug 4914: Do not call setsid() in --foreground mode
- Bug 4875 pt2: GCC-8 compile errors with -O3 optimization
- Bug 4856: Exit when GoIntoBackground() fork() call fails
- basic_ldap_auth: Return BH on internal errors; polished messages
- Fix BodyPipe/Sink memory leaks associated with auto-consumption
- Fix OpenSSL builds that define OPENSSL_NO_ENGINE
- Fix several cases of rock cache corruption
- Add Georgian (ka) language translation