Need Freebsd Version And Tun not work on freebsd

build code：

git clone https://github.com/SagerNet/sing-box.git
cd sing-box
export GOPROXY=https://goproxy.cn
export CGO_ENABLED=0 GOOS=freebsd
make

tun is not work,include system and gvisor

FATAL[0000] start service: initialize inbound/tun[0]: configure tun interface: invalid argument

see this: https://github.com/xjasonlyu/tun2socks

it's good

sing-box's tun support includes a lot more than other projects. Since I don't use *bsd, you may need to write and submit MR yourself, pay attention to writing tests.

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