[PATCH v2 0/3] MR3578: freopen() fix.

[eric pouech (＠epo)]

I stumbled onto this while using freopen() for debugging purposes.
Basically, freopen() fails if the FILE has been created with
an invalid handle.

So, this MR contains:
- basic tests for freopen (no issue there, just for coverage purposes)
- tests for freopen on FILE with invalid handle
- fix for freopen

--
  v2: msvcrt: Fix freopen() on FILE with handle=-2.
      isfd
      msvcrt/tests: Add tests for freopen().

https://gitlab.winehq.org/wine/wine/-/merge_requests/3578