* mod_mem_cache: Convert mod_mem_cache to use APR memory pool functions

      by creating a root pool for object persistence across requests. This
      also eliminates the need for custom serialization code.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@484642 13f79535-47bb-0310-9956-ffa450edef68