[PATCH v2 0/7] MR6041: Cmd engine rewrite (part XIX)

[eric pouech (＠epo)]

This is part XIX of cmd engine rewrite.

It's the last MR (for now) for setting success/failure
return code on internal commands.

The remaining todo in this area are due to:
- incompletly implemented builtin (eg: TYPE not handling
  multiple files, not wildcards; CHOICE missing a bunch
  of features; ...),
- some commands (like START) being implemented as external
  executables, hence forcing RETURN CODE = ERRORLEVEL
  which is not always wanted,

--
  v2: cmd: Cleanup transition bits.
      cmd: Improve return code/errorlevel support for external commands.
      cmd: Move empty batch command handling to WCMD_batch() callers.
      cmd: Set success/failure return code for START command.
      cmd: Set success/failure return code for MKLINK command.
      cmd: Add more tests for return codes in builtin commands.
      cmd: Get rid of CTTY command.

https://gitlab.winehq.org/wine/wine/-/merge_requests/6041