Win32: Improve error reporting after a failed attempt to spawn a

piped log process or rewrite map process.

Submitted by: trawick
Reviewed by:  stoddard, nd


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@104161 13f79535-47bb-0310-9956-ffa450edef68