mod_cgi: Fix some problems where the wrong error value was being traced

(errno instead of apr_status).

mod_cgid: Keep some of the code in synch with the version in mod_cgi.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87576 13f79535-47bb-0310-9956-ffa450edef68