build: add new menuconfig code based on linux 3.9 git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36361 3c298f89-4303-0410-b956-a3cf2f4a3e73
modify the kconfig system for openwrt git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@3683 3c298f89-4303-0410-b956-a3cf2f4a3e73