mciseq: Ensure the player thread termination when stopping.

[Akihiro Sagawa]

Without this patch, the thread can be alive immediately after calling
MIDI_mciStop. This confuses mciClose and leads to crash because dwStatus is
already updated in the last mciStop call.
---
 dlls/mciseq/mcimidi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

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