backport r1610501 from trunk:

      *) SECURITY: CVE-2014-0118 (cve.mitre.org)
         mod_deflate: The DEFLATE input filter (inflates request bodies) now
         limits the length and compression ratio of inflated request bodies to avoid
         denial of sevice via highly compressed bodies.  See directives
         DeflateInflateLimitRequestBody, DeflateInflateRatioLimit,
         and DeflateInflateRatioBurst.

    Thanks to Giancarlo Pellegrino and Davide Balzarotti for reporting the issue.

Submitted By: ylavic, covener
Reviewed By: jorton, covener, jim 



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1610503 13f79535-47bb-0310-9956-ffa450edef68