- fix 'Illegal Instructions" crash on some platform
$ go version
go version go1.9 darwin/amd64
4aaf974
xtaci/kcp-go@44c3d76
xtaci/smux@ebec7ef
https://github.com/templexxx/reedsolomon/tree/0.1.1
74204755d1fcded11cbccba23f5693299af75373 kcptun-linux-amd64-20170930.tar.gz
4c5feeba8693644a6962fe7955d0ac8da925c3be kcptun-linux-386-20170930.tar.gz
fa1a3daf57a41d15678a989cc3fde999975b1ecf kcptun-darwin-amd64-20170930.tar.gz
d2c6cad44cf930548ecc7fc2b833cb7a5e6e101d kcptun-darwin-386-20170930.tar.gz
4022da27c2206ef369ce5f19dc1c6a33851c4f17 kcptun-windows-amd64-20170930.tar.gz
e409779c136eef3e52b3c65c01348a8368b1845e kcptun-windows-386-20170930.tar.gz
c8bdd0787beca5ab44075dee58a4f114b65f4cca kcptun-freebsd-amd64-20170930.tar.gz
5d5e570315a977649cc89830de521a44688ad1c5 kcptun-freebsd-386-20170930.tar.gz
b40de337d590882cdf0218037662da00caf090e2 kcptun-linux-arm-20170930.tar.gz
bee1a9de3a3b288b21586695e2678598ccc21880 kcptun-linux-mipsle-20170930.tar.gz
2f65ee825a079337214db3e0c7e1086169ffe22e kcptun-linux-mips-20170930.tar.gz