http_core was mmap()ing even in cases where it wasn't going to

read the file.

Submitted by:	Ben Hyde <bhyde@gensym.com>
Reviewed by:	Dean Gaudet, Martin Kraemer


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79584 13f79535-47bb-0310-9956-ffa450edef68