The final line of the config file was not being read if there was

The final line of the config file was not being read if there was
no \n at the end of it.  This was caused by apr_fgets returning
APR_EOF even though we had read valid data.  This is solved by
making cfg_getline check the buff that was returned from apr_fgets.
If apr_fgets return APR_EOF, but there was data in the buf, then we
return the buf, otherwise we return NULL.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86643 13f79535-47bb-0310-9956-ffa450edef68