message: Use debug instead of println for emscripten mocks
diff: @@ -58,7 +58,7 @@ pub fn emscripten_set_up_memory(memory: &mut LinearMemory) {
  macro_rules! mock_external {
  ($import:ident, $name:ident) => {{
  fn _mocked_fn() {
  - println!("emscripten::{} <mock>", stringify!($name));
  + debug!("emscripten::{} <mock>", stringify!($name));
  // return 0
  }
  $import.set(
  