[1/4] D3D9: Implement IDirect3DDevice9::StretchRect

[Christoph Bumiller]

This also (partially) fixes the issue with NFS:MW where nothing except 
the menus appears to be draw when setting the Visual Treatment option 
to high.

The scene is now visible, but its scaled down in the y direction and 
only covers about the top 2/3 of the screen ...