toolchain:
 * disable download-toolchain for uClibc-0.9.33.x based firmwares (the one provided in r10511 doesn't work)
 * refs #2103, refs #1939


git-svn-id: file:///var/svn/freetz/trunk@10525 149334a1-2f27-0410-a3b9-fc62619ac1e6