updated build.xml to exclude backends....still testing
updated build.xml to exclude backends....still testing

git-svn-id: https://svn.sable.mcgill.ca/mclab/Project@2353 89b902b4-d83f-0410-b942-89f7a419ffdb

Migrated from Sable/mclab@22bfca532b07f60e7e1fc33c6b9237c6c8d12063

Sable/VRIRGenerator