borrow of packed field is unsafe

[pusateri]

rust lang issue #46043 describes the problem. The error shows up on NetBSD tests for sys/socket/mod.rs:262 and sys/socket/addr.rs:500

--> src/sys/socket/addr.rs:500:9
    |
500 |         self.0.s_addr.hash(s)
    |         ^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!

[pusateri]

% rustup show
Default host: x86_64-unknown-netbsd

stable-x86_64-unknown-netbsd (default)
rustc 1.30.1 (1433507eb 2018-11-07)