dinput: Prevent race between destroying the hook window and unloading the dll [try 2]

[Vitaliy Margolen]

Fixes bug 8301.

Try 2:
Remove class atom completelly.
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 dlls/dinput/dinput_main.c |   34 ++++++++++++++++++----------------
 1 files changed, 18 insertions(+), 16 deletions(-)
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