Fix for #3480 (patch by Wolfgang Küllinger)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33581 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] new solve code enabled for polynomial systems

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33582 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e