add errno to suexec error messages

PR:		1543
Obtained from:
Submitted by:	Marc Slemko
Reviewed by:	Dean Gaudet, Martin Kraemer, Jim Jagielski


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79943 13f79535-47bb-0310-9956-ffa450edef68