Update ap_send_fd() and ap_send_fd_length() to use an ap_file_t. Hummm...

Still need to get sendfile() in. First, lets get the serving basically
working again :-)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83930 13f79535-47bb-0310-9956-ffa450edef68