GUI: remove reference in project file to obsolete package. 
GUI: remove reference in project file to obsolete package. 

git-svn-id: c451f99c539e6b066ec18a47a9c67064d2e0d34d@8728 fc29be9c-2cb0-420d-b520-73dbd18add6e

opensim-org/opensim-gui,opensim-org/opensim-gui,opensim-org/opensim-gui,opensim-org/opensim-gui