Remove pub(crate) export of macro

tcharding · tcharding · commit 7c09b73f4d9f · 2025-10-07T13:31:58.000+11:00
This macro is only used in the file it is defined, remove the
unnecessary re-export.

Found by `clippy`.
diff --git a/io/src/hash.rs b/io/src/hash.rs
@@ -30,7 +30,6 @@ macro_rules! impl_write {
         }
     }
 }
-pub(crate) use impl_write;
 
 impl_write!(
     hash160::HashEngine,
