add compatibility with older rust versions

Author: Gleb Pomykalov

src/sys/socket/sockopt.rs

@@ -373,7 +373,7 @@ unsafe impl<T> Get<T> for GetStruct<T> {
 }
 
 /// Setter for bytes.
-struct SetBytes<'a, T> where T: AsRef<[u8]> {
+struct SetBytes<'a, T> where T: 'a + AsRef<[u8]> {
     ptr: &'a T,
 }
 

test/sys/test_socket.rs

@@ -189,6 +189,7 @@ pub fn test_scm_rights() {
 #[cfg(any(target_os = "linux", target_os= "android"))]
 #[test]
 pub fn test_af_alg_cmsg() {
+    use libc;
     use nix::sys::uio::IoVec;
     use nix::unistd::read;
     use nix::sys::socket::{socket, sendmsg, bind, accept, setsockopt,