Fix the inability to log errors like exec failure in

mod_ext_filter/mod_cgi script children (e.g., exec failure).  This
was broken after such children stopped inheriting the error log
handle.

(For this to work with mod_ext_filter, that module's LogStderr option
has to be on.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@99211 13f79535-47bb-0310-9956-ffa450edef68