structs nlmsghdr, nlmsgerr and nlattr added to linux mips musl target

src/unix/linux_like/linux/musl/b32/mips/mod.rs

@@ -161,6 +161,24 @@ s! {
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
+
+    pub struct nlmsghdr {
+        pub nlmsg_len: u32,
+        pub nlmsg_type: u16,
+        pub nlmsg_flags: u16,
+        pub nlmsg_seq: u32,
+        pub nlmsg_pid: u32,
+    }
+
+    pub struct nlmsgerr {
+        pub error: ::c_int,
+        pub msg: nlmsghdr,
+    }
+
+    pub struct nlattr {
+        pub nla_len: u16,
+        pub nla_type: u16,
+    }
 }
 
 pub const SIGSTKSZ: ::size_t = 8192;