[giac] fix win32 dll build. Improve n-d solver if some equations are univariate and should therefore answer to ticket 3381.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26081 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Changing giac.js to the latest version in web/kickstart.xml

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26082 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e