v3.5.22

Changes to squid-3.5.22 (09 Oct 2016):

- Bug 4594: build failure with clang 3.9
- Bug 4471: revalidation does not work when expired cached object lacks Last-Modified
- Bug 4302 pt2: IPv6 support for IPFilter v5 transparent interception
- Bug 4228: ./configure bug/typo in r14394
- Bug 3819: "fd >= 0" assertion in file_write() during reconfiguration
- Bug 2833: Collapse internal revalidation requests (SMP-unaware caches)
- Fix logged request size (%http::>st) and other size-related %codes
- Fix some memory leaks from putenv()
- Fix memory leaks from url_rewrite_extras and store_id_extras on reconfigure/shutdown
- Fix segfault crash when debugging section 4 at level 9
- HTTP: MUST ignore a [revalidation] response with an older Date header