hurd: Drop using mod align

It is not used.

(backport <rust-lang#4029>)
(cherry picked from commit e2153f1)

Author: sthibaul

src/unix/hurd/align.rs

@@ -4675,16 +4675,6 @@ safe_f! {
     }
 }
 
-cfg_if! {
-    if #[cfg(libc_align)] {
-        mod align;
-        pub use self::align::*;
-    } else {
-        mod no_align;
-        pub use self::no_align::*;
-    }
-}
-
 cfg_if! {
     if #[cfg(target_pointer_width = "64")] {
         mod b64;