[giac] missing _ggbCallGiac()

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26019 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.149.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26020 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e