struct a_file needs field mm to compile at all when

APR_HAS_MMAP is defined

check for APR_HAS_SENDFILE around the declaration of
file; most of the other sendfile logic does this already
Submitted by:	Greg Ames
Reviewed by:	Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85768 13f79535-47bb-0310-9956-ffa450edef68