Add ENOATTR for Linux

Author: PlasmaPower

libc-test/build.rs

@@ -171,6 +171,7 @@ fn main() {
         if !uclibc {
             // optionally included in uclibc
             cfg.header("sys/xattr.h");
+            cfg.header("attr/xattr.h");
         }
         cfg.header("sys/ipc.h");
         cfg.header("sys/msg.h");

src/unix/notbsd/linux/mod.rs

@@ -1016,3 +1016,5 @@ cfg_if! {
         pub use self::other::*;
     }
 }
+
+pub const ENOATTR: ::c_int = ::ENODATA;