[3/3] DDraw: Hold the dll lock in IDirectDraw methods

[Stefan Dösinger]

WRT holding the lock in SetCooperativeLevel and SetDisplayMode, which may send 
signals to the window: I highly believe that windows keeps the lock held in 
those functions too. Should a ddraw app try to call ddraw method in a signal 
handler from another thread, then I am sure the fact that the signal is sent 
is wrong, rather than the fact that we hold the lock when sending the signal. 
Unfortunately I don't know how to proove that in a test case.

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