message: Remove wasi_env_write_stdin
diff: @@ -548,23 +548,6 @@ pub unsafe extern "C" fn wasi_env_read_stderr(
  }
  }
  -#[no_mangle]
  -pub unsafe extern "C" fn wasi_env_write_stdin(
  - env: &mut wasi_env_t,
  - buffer: *const u8,
  - buffer_len: usize,
  -) -> bool {
  - let mut store_mut = env.store.store_mut();
  - let state = env.inner.data_mut(&mut store_mut).state();
  - let mut stdin =
  - c_try!(state.stdin(); otherwise false).ok_or("Could not access WASI's state stdin");
  - let wasi_stdin = c_try!(stdin.as_mut(); otherwise false);
  - let buffer = slice::from_raw_parts(buffer, buffer_len);
  - let msg = c_try!(std::str::from_utf8(buffer); otherwise false);
  - c_try!(write!(wasi_stdin, "{}", msg); otherwise false);
  - true
  -}
  -
  fn read_inner(
  wasi_file: &mut Box<dyn WasiFile + Send + Sync + 'static>,
  inner_buffer: &mut [u8],
  