cleanup; replace .PHONY with FORCE; disable gdb by default

openwrt/target/Makefile

openwrt/target/linux/ar7-2.4/Makefile

openwrt/target/linux/brcm-2.4/Makefile

openwrt/target/linux/image/Makefile

openwrt/target/linux/image/aruba/Makefile

openwrt/target/linux/image/au1000/Makefile

openwrt/target/linux/image/brcm/Makefile

openwrt/target/linux/image/jffs2.mk

openwrt/target/linux/image/jffs2/Makefile

openwrt/target/linux/image/squashfs.mk

openwrt/target/linux/image/squashfs/Makefile

openwrt/target/linux/image/tgz.mk

openwrt/target/linux/image/x86/Makefile

openwrt/target/linux/image/xscale/Makefile

openwrt/target/linux/imagebuilder/Makefile

openwrt/target/linux/kernel.mk

openwrt/target/linux/package/Makefile

openwrt/target/lzma/Makefile

openwrt/target/utils/Makefile

openwrt/toolchain/Config.in