run the sendfile test automatically

git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1523844 13f79535-47bb-0310-9956-ffa450edef68
typo in comment

git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1523845 13f79535-47bb-0310-9956-ffa450edef68