Deal with Win32 spawn of the Devil problems. Also add buildmark support

(I know, I know, these should be separate, but I'm in a hurry and I forgot).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79617 13f79535-47bb-0310-9956-ffa450edef68