Remove unused compose function.

src/lib.rs

@@ -99,11 +99,3 @@ pub fn etc_dir(ephemeral: bool) -> PathBuf {
         PathBuf::from("/etc")
     }
 }
-
-pub fn compose<A, B, C, G, F>(f: F, g: G) -> impl Fn(A) -> C
-where
-    F: Fn(B) -> C,
-    G: Fn(A) -> B,
-{
-    move |x| f(g(x))
-}