Update Windows make files to include Expat.

And giving Keith credit for submitting the expat win32 project files I committed earlier!
Submitted by:	Keith Wannamaker
Reviewed by:	Bill Stoddard


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84149 13f79535-47bb-0310-9956-ffa450edef68