if the perl interpreter is not found in PATH, use

"/replace/with/path/to/perl/interpreter" for the path when
substituting in split-logfiles et al so that an unlucky user
will have a better clue about why these programs won't work


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88622 13f79535-47bb-0310-9956-ffa450edef68