Replace this unknown hash function someone contributed with the classical DJB

times 33 hash (using XOR instead of ADD).  This hash is better understood and
is faster. Also because in the old function the "& 0xff" was not necessary and
just slowed down processing.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@85845 13f79535-47bb-0310-9956-ffa450edef68