Compile BBR on lastest Openwrt/LEDE release for kernel >= 4.14.*
中文：https://cosmiccat.net/2018/04/281/
Modified BBR: https://github.com/anshi233/BBR_MOD
Usage:
	Get openwrt latest source code:
	git clone https://git.openwrt.org/openwrt/openwrt.git
	
	enter Openwrt source root
	
	git clone https://github.com/anshi233/Openwrt-BBR.git package/Openwrt-BBR
	
To compile BBR orginal version:	
	make menuconfig
	select Kernel modules --> Network Support ---> kmod-bbr
	make package/Openwrt-BBR/bbr_origin/compile V=99
	
	Enable bbr on your device:
	install kmod-bbr ipk using opkg
	insmod bbr
	echo "bbr" > /etc/modules.d/bbr
	add "net.ipv4.tcp_congestion_control=bbr" to /etc/sysctl.conf
	save and run "sysctl -p"
	done
	
To compile BBR modified version:
	make menuconfig
	select Kernel modules --> Network Support ---> kmod-bbr_mod
	make package/Openwrt-BBR/bbr_mod/compile V=99
	
	Enable bbr on your device:
	install kmod-bbr_mod ipk using opkg
	insmod tcp_bbr_mod
	echo "tcp_bbr_mod" > /etc/modules.d/bbr
	add "net.ipv4.tcp_congestion_control=tcp_bbr_mod" to /etc/sysctl.conf
	save and run "sysctl -p"
	done