[PATCH v5 0/1] MR734: tests: Make sure only one thread prints traces at a time.

[Francois Gouget (＠fgouget)]

Some Wine tests are multi-threaded or start child processes which can
result in traces and failure messages being garbled which prevents them
from being recognized by continuous integration tools.
So printing the tests messages is now serialized. Note that if a process
crashes while holding the mutex, that mutex will be abandonned and not
cause a deadlock.

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  v5: tests: Make sure only one thread prints traces at a time.

https://gitlab.winehq.org/wine/wine/-/merge_requests/734