busybox:
 * make FREETZ_BUSYBOX_FEATURE_BUFFERS_GO_ON_STACK the default one as it was before r9856
 * refs #1786, refs r9870


git-svn-id: file:///var/svn/freetz/trunk@9884 149334a1-2f27-0410-a3b9-fc62619ac1e6