Merge r1626978 from trunk:

mod_cgi: log cgi script stderr to ScriptLog, use APLOGNO for log_scripterror
errors.

Submitted by: jkaluza
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1651085 13f79535-47bb-0310-9956-ffa450edef68