Revert "Remove ::solana_sdk hack (solana-labs#11326)"

This reverts commit c099b29.

Author: mvines

sdk/src/entrypoint_native.rs

@@ -58,12 +58,16 @@ macro_rules! declare_name {
                 // `declare_name(foo)`
                 //
                 // See the `respan!` macro for more details.
+                // This should use `crate::respan!` once
+                // https://github.com/rust-lang/rust/pull/72121 is merged:
+                // see https://github.com/solana-labs/solana/issues/10933.
+                // For now, we need to use `::solana_sdk`
                 //
                 // `respan!` respans the path `$crate::id`, which we then call (hence the extra
                 // parens)
                 (
                     stringify!($filename).to_string(),
-                    $crate::respan!($crate::$id, $name)(),
+                    ::solana_sdk::respan!($crate::$id, $name)(),
                 )
             };
         }