winemac: Don't use the main dispatch queue to implement OnMainThread() for a thread with no event queue.

[Ken Thomases]

The main dispatch queue is a serial queue and is a shared resource.  If we
submit a long-running task to it, then no other tasks, including those submitted
by the system frameworks, can run until it completes.

This differs from the run-loop source we use for OnMainThreadAsync() since
run loops can be nested.

So we use OnMainThreadAsync() and its run-loop source to submit the task to the
main thread for both cases.  When we don't have a queue to wait on, we just use
a semaphore to wait for the task to complete.
---
dlls/winemac.drv/cocoa_event.m |   49 +++++++++++++++++++++++++--------------
1 files changed, 31 insertions(+), 18 deletions(-)

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