Mara Bos f534b75f05 Use Vec<u8> for LOCAL_STD{OUT,ERR} instead of dyn Write.
It was only ever used with Vec<u8> anyway. This simplifies some things.

- It no longer needs to be flushed, because that's a no-op anyway for
  a Vec<u8>.

- Writing to a Vec<u8> never fails.

- No #[cfg(test)] code is needed anymore to use `realstd` instead of
  `std`, because Vec comes from alloc, not std (like Write).
2020-11-10 21:58:09 +01:00
..