Upgrade the child spawning code in mod_rewrite for the RewriteMap programs:

ap_spawn_child_err() is used and the Win32 case now uses CreateProcess()
instead of a low-level execl() (which caused problems in the past under
Win32).

Reviewed by: Ben Laurie


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81379 13f79535-47bb-0310-9956-ffa450edef68