Encourage best practice in Perl scripts (use strict, warnings).

Backport of r1335882 and r1325724 from trunk.

Submitted by: rbowen
Reviewed by: rjung, humbedooh
Backported by: rjung


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1364713 13f79535-47bb-0310-9956-ffa450edef68