std.c: fix return type of recv/recvfrom on windows
Windows defines `recv` and `recvfrom` to return a value of type `int`,
rather than a pointer-sized signed integer, and so should use `c_int`
rather than `isize` for their return types.
3add9d8257dweiller committed on 6/3/2023, 8:45:52 PM· committed by Andrew Kelleyparentff57a26