Move serde_if_integer128 macro to serde

serde_core/src/integer128.rs

@@ -1,9 +0,0 @@
-// No longer used. Old versions of serde used this macro for supporting targets
-// that did not yet have 128-bit integer support.
-#[macro_export]
-#[doc(hidden)]
-macro_rules! serde_if_integer128 {
-    ($($tt:tt)*) => {
-        $($tt)*
-    };
-}

serde_core/src/lib.rs

@@ -240,9 +240,6 @@ macro_rules! tri {
 #[macro_use]
 mod macros;
 
-#[macro_use]
-mod integer128;
-
 pub mod de;
 pub mod ser;