Removing unused references

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38126 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removing reference to XML GWT package

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38127 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e