Add boilerplate to webAppCreator build.xml files to supply a -d32 arg
when the runtime JVM is 64-bit. Currently this happens only on Mac.

Review by: jat, scottb



git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.7@6156 8db76d5a-ed1c-0410-87a9-c151d255dfc7