[PATCH v2 0/4] MR8191: ntdll: Duplicate handles for thread pool waits.

[Conor McCarthy (＠cmccarthy)]

Windows allows closure of a waitable timer handle while a work item is
waiting on it. Also, the current Wine ntdll implementation calls
NtWaitForMultipleObjects() on multiple handles if multiple items are
pending, and if one handle is not valid, no items will execute.

Btw there are occurrences of `INVALID_HANDLE_VALUE` elsewhere, e.g. in `RtlDeleteTimer()`, which I think are incorrect, unless Windows internals are inconsistent with its use.

--
  v2: ntdll: Duplicate handles for thread pool waits.
      ntdll: Initialise waitable handles with NULL.
      ntdll/tests: Test early closure of handles used for threadpool waits.

https://gitlab.winehq.org/wine/wine/-/merge_requests/8191