[backfire] tools: merge r29293 (use host build_dir instead of target build_dir) git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@29317 3c298f89-4303-0410-b956-a3cf2f4a3e73
[backfire] merge r25974 git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@25975 3c298f89-4303-0410-b956-a3cf2f4a3e73