Added the recv_tos socket option

[JoNil]

No description provided.

[Thomasdezeeuw]

The addition sounds good, but this needs tests and Windows support (see https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options).

[JoNil]

I didn't find the IP_RECVTOS symbol in winapi-rs. Does anyone know if it is supported there and is just not exposed?

[Thomasdezeeuw]

I didn't find the IP_RECVTOS symbol in winapi-rs. Does anyone know if it is supported there and is just not exposed?

I can't find it either. Perhaps we should move to windows_sys (it has it: https://docs.rs/windows-sys/latest/windows_sys/Win32/Networking/WinSock/constant.IP_RECVTOS.html), but that's a larger topic. For now you can remove Window support and we'll open issue to add it later.

[JoNil]

In the last commit i added windows the the cfg so that it is not included :)

[Thomasdezeeuw]

Thanks @JoNil.