Remove all occurances of strerror from Apache. ap_strerror works just

fine with standard errno values, and it is more portable.  This also allows
me to remove the check for strerror from Apache's configure script.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85486 13f79535-47bb-0310-9956-ffa450edef68