[giac] load .dll files from jars

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25092 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
switching default CAS to Giac in desktop (for testing)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25093 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Waste less space in AV

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25094 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix compile error

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25095 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e