[giac] set version strings to Giac/JS, Giac/JNI as appropriate

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25333 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] back to normal method of loading DLLs

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25334 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e