Stabilize seal_call (#1041)

Author: Michael Müller

RELEASES.md

@@ -16,13 +16,11 @@ This is the 7th release candidate for ink! 3.0.
   - Annotating a wildcard selector in traits is not supported.
 
 ## Changed
-- Upgraded to the unstable `seal_call` API ‒ [#960](https://github.com/paritytech/ink/pull/960).
+- Upgraded to the `seal_call` v1 API ‒ [#960](https://github.com/paritytech/ink/pull/960).
   - This API now enables control over the behavior of cross-contract calls, e.g. to forward/clone input,
     enable tail calls and control reentrancy.
     The crate documentation contains more details on the [`CallFlags`](https://paritytech.github.io/ink/ink_env/struct.CallFlags.html).
   - **Note:** The default behavior of cross-contract calls now disallows reentering the calling contract.
-  - **Note:** In order to support this you currently have to enable the `unstable-interface` of
-    the `contracts` pallet, [like here](https://github.com/paritytech/substrate-contracts-node/blob/main/runtime/Cargo.toml#L104-L108).
 - ink! contract definitions via `#[ink::contract]`:
     - ink! smart contracts now generate two contract types. Given `MyContract`:
     - `MyContract` will still be the storage struct.

crates/env/src/engine/on_chain/ext.rs

@@ -312,10 +312,7 @@ mod sys {
             output_ptr: Ptr32Mut<[u8]>,
             output_len_ptr: Ptr32Mut<u32>,
         );
-    }
 
-    #[link(wasm_import_module = "__unstable__")]
-    extern "C" {
         pub fn seal_call(
             flags: u32,
             callee_ptr: Ptr32<[u8]>,
@@ -326,7 +323,10 @@ mod sys {
             output_ptr: Ptr32Mut<[u8]>,
             output_len_ptr: Ptr32Mut<u32>,
         ) -> ReturnCode;
+    }
 
+    #[link(wasm_import_module = "__unstable__")]
+    extern "C" {
         pub fn seal_ecdsa_recover(
             // 65 bytes of ecdsa signature
             signature_ptr: Ptr32<[u8]>,