Remove MMAP handling from the default handler. MMAPs are created by the

file_bucket read function now.  If we try to read from a file bucket and
it makes sense to convert that bucket to an MMAP, that just happens.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86894 13f79535-47bb-0310-9956-ffa450edef68