udp2raw

udp2raw fix on OpenWrt 18.06
luci app error seems to be the udp2raw binary got segmentation fault
so, solution was using static lib

DEPENDS:= +libstdcpp +libpthread +librt
$(INSTALL_DIR) $(1)/usr/bin

On: https://github.com/WouldChar/openwrt-udp2raw-speeder/blob/master/udp2raw/Makefile

original udp2raw: https://github.com/sensec/