Added DX9 to DX11.2 build configuration

As DX11.2/Desktop depends on DX SDK anyway, I have added only SharpDX.Direct3D9 assebly to DX11.2 build configuration, also I have added support for WPF in DX11.2 by removing preprocessor directives.

@xoofx, please review this and let me know if it is ok to merge it (I will do the merge after your confirmation).