[giac] revert to older DLLs (broken links)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26162 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] updated JUnit Tests

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26163 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e