message: fix(c-api) Remove `Box` from `wasm_functype_new`.
diff: use super::{wasm_externtype_t, wasm_valtype_vec_delete, wasm_valtype_vec_t, WasmExternType};
  -use std::mem;
  use wasmer::{ExternType, FunctionType, ValType};
  #[derive(Debug)]
  @@ -56,11 +55,11 @@ wasm_declare_boxed_vec!(functype);
  #[no_mangle]
  pub unsafe extern "C" fn wasm_functype_new(
  - params: Option<Box<wasm_valtype_vec_t>>,
  - results: Option<Box<wasm_valtype_vec_t>>,
  + params: Option<&mut wasm_valtype_vec_t>,
  + results: Option<&mut wasm_valtype_vec_t>,
  ) -> Option<Box<wasm_functype_t>> {
  - let mut params = params?;
  - let mut results = results?;
  + let params = params?;
  + let results = results?;
  let params_as_valtype: Vec<ValType> = params
  .into_slice()?
  @@ -73,11 +72,8 @@ pub unsafe extern "C" fn wasm_functype_new(
  .map(|val| val.as_ref().into())
  .collect::<Vec<_>>();
  - wasm_valtype_vec_delete(Some(params.as_mut()));
  - wasm_valtype_vec_delete(Some(results.as_mut()));
  -
  - mem::forget(params);
  - mem::forget(results);
  + wasm_valtype_vec_delete(Some(params));
  + wasm_valtype_vec_delete(Some(results));
  Some(Box::new(wasm_functype_t::new(FunctionType::new(
  params_as_valtype,
  