[3/12 WineD3D/DDraw: Forward DDSCL_MULTITHREADED to WineD3D

[Stefan Dösinger]

> What exactly is this supposed to fix? We already pass the behaviour
> flags through to IWineD3DImpl_CreateDevice(), so shouldn't wined3d
> just handle it there?
In DirectDraw the multithreading flag is set after creating the device, so I 
need a seperate method to set it in wined3d, because I don't know it at 
initialization time. This method has to initialize the thread safety things 
in wined3d.

Now d3d8 and d3d9 call SetMultithreaded too because it is clearer to have 
SetMultithreaded called by ddraw, d3d8 and d3d9 instead of ddraw and wined3d. 
On the other hand, there are now 2 places where the multithreaded flag is 
passed to wined3d now, CreateDevice and SetMultithreaded.

I could call SetMultithreaded from wined3d::CreateDevice, and not call it from 
d3d8/9, or I could remove the WINED3DCREATE_MULTITHREADED flag from the 
public wined3d_interface.h header, sinaling that CreateDevice ignores that 
flag? Or anything I missed?
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