mod_cache: If a 304 response indicates an entity not currently cached, then
the cache MUST disregard the response and repeat the request without the
conditional.

trunk patch: http://svn.apache.org/r1481197
2.4.x patch: http://people.apache.org/~minfrin/httpd-mod_cache-uncacheable304-2.4.patch

Submitted by: minfrin
Reviewed by: jim, wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1487131 13f79535-47bb-0310-9956-ffa450edef68