fix build on DragonFly: IP_RECVTOS and join_leave_ssm_v4() disabled

[kworr]

Well, it makes build and tests clean. Not sure if I'm doing it right though.

Also IP_RECVTOS support issue do prevent socket2 v0.4.6 building.

[kworr]

Actual problem with ssm:

thread 'join_leave_ssm_v4' panicked at 'Joined SSM: Os { code: 42, kind: Uncategorized, message: "Protocol not available" }', tests/socket.rs:1246:53

[Thomasdezeeuw]

Can you also enable the the test:

socket2/tests/socket.rs

Line 1252 in 7127683

fn join_leave_ssm_v4() {

.

[kworr]

Can you also enable the the test:

socket2/tests/socket.rs

Line 1252 in 7127683

fn join_leave_ssm_v4() {

.

I'm bit sure I got this right, if I enable this test while SSM functions are disabled I'll get this:

   Compiling socket2 v0.4.6 (/home/arcade/work/socket2.other)
error[E0599]: no method named `join_ssm_v4` found for struct `Socket` in the current scope
    --> tests/socket.rs:1246:21
     |
1246 |     let () = socket.join_ssm_v4(&s, &g, &interface).expect("Joined SSM");
     |                     ^^^^^^^^^^^ method not found in `Socket`

error[E0599]: no method named `leave_ssm_v4` found for struct `Socket` in the current scope
    --> tests/socket.rs:1247:21
     |
1247 |     let () = socket.leave_ssm_v4(&s, &g, &interface).expect("Left SSM");
     |                     ^^^^^^^^^^^^ method not found in `Socket`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `socket2` due to 2 previous errors

Though I'm testing on 0.4.6, can't build trunk as of right now.

[Thomasdezeeuw]

@kworr sorry in my haste I read the cfg wrong, it has a not around I didn't read. Thanks for the changes.

If you want I can backport this into v0.4.x.

[kworr]

Yes, please, if this can be backported to 0.4.x that would be nice.