build.xml now also creates a minimum distributable needed for runtime only (wsc-23-min.jar)

git-svn-id: http://sfdc-wsc.googlecode.com/svn/trunk/wsc23@66 dba828e3-b04d-0410-b74f-e525cf9b10fa
(cherry picked from commit 3d3d5f81d239c4bb0da42096b6f0025a68de78f0)