also properly disable SSM for DragonFly

Author: kworr

src/socket.rs

@@ -1192,6 +1192,7 @@ impl Socket {
     /// multicast group. If it's [`Ipv4Addr::UNSPECIFIED`] (`INADDR_ANY`) then
     /// an appropriate interface is chosen by the system.
     #[cfg(not(any(
+        target_os = "dragonfly",
         target_os = "haiku",
         target_os = "netbsd",
         target_os = "redox",
@@ -1224,6 +1225,7 @@ impl Socket {
     ///
     /// [`join_ssm_v4`]: Socket::join_ssm_v4
     #[cfg(not(any(
+        target_os = "dragonfly",
         target_os = "haiku",
         target_os = "netbsd",
         target_os = "redox",

src/sys/unix.rs

@@ -106,6 +106,7 @@ pub(crate) use libc::{
     SO_RCVTIMEO, SO_REUSEADDR, SO_SNDBUF, SO_SNDTIMEO, SO_TYPE, TCP_NODELAY,
 };
 #[cfg(not(any(
+    target_os = "dragonfly",
     target_os = "haiku",
     target_os = "netbsd",
     target_os = "redox",