std: Fix IPV6 imports for solaris

Like BSDs, Solaris maps `IPV6_ADD_MEMBERSHIP` and `IPV6_DROP_MEMBERSHIP`
from `IPV6_JOIN_GROUP` and `IPV6_LEAVE_GROUP` respectively.

Author: cuviper

src/libstd/sys/common/net.rs

@@ -25,19 +25,23 @@ use time::Duration;
 
 #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
           target_os = "ios", target_os = "macos",
-          target_os = "openbsd", target_os = "netbsd"))]
+          target_os = "openbsd", target_os = "netbsd",
+          target_os = "solaris"))]
 use sys::net::netc::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
 #[cfg(not(any(target_os = "dragonfly", target_os = "freebsd",
               target_os = "ios", target_os = "macos",
-          target_os = "openbsd", target_os = "netbsd")))]
+              target_os = "openbsd", target_os = "netbsd",
+              target_os = "solaris")))]
 use sys::net::netc::IPV6_ADD_MEMBERSHIP;
 #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
           target_os = "ios", target_os = "macos",
-          target_os = "openbsd", target_os = "netbsd"))]
+          target_os = "openbsd", target_os = "netbsd",
+          target_os = "solaris"))]
 use sys::net::netc::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
 #[cfg(not(any(target_os = "dragonfly", target_os = "freebsd",
               target_os = "ios", target_os = "macos",
-          target_os = "openbsd", target_os = "netbsd")))]
+              target_os = "openbsd", target_os = "netbsd",
+              target_os = "solaris")))]
 use sys::net::netc::IPV6_DROP_MEMBERSHIP;
 
 ////////////////////////////////////////////////////////////////////////////////