`AF_SYSTEM` and `AF_SYS_CONTROL` types do not fit in `sockaddr_ctl`

[siegfried]

I'm trying to assign AF_SYSTEM to sockaddr_ctl.sc_family which is a u_char, but AF_SYSTEM is c_int.

AS_SYS_CONTROL should be u16 in sockaddr_ctl.ss_sysaddr as well yet its definition is c_int.

pub const AF_SYS_CONTROL: ::c_int = 2;

[tgross35]

Are these flags ever passed to functions?

main is now for 1.0, so your PR can probably be adjusted.