[2/5] wined3d: Fix depth buffer formats to use actual depth textures

[Ivan Gyurdiev]

H. Verbeet wrote:
> Two things to note here:
>  - We use GL_DEPTH_COMPONENT24_ARB as internal format for 16-bit
> depth textures. This is needed because GL_DEPTH_COMPONENT16_ARB
> doesn't work with FBOs.
>  - We don't properly support combined depth and stencil buffer
> formats yet. To support this properly we need to be able to detect if
> the relevant extensions are available or not.
>
Was GL_ARB_DEPTH_TEXTURE detection added to wine recently?
I don't have the latest copy. If not, needs to be added to take 
advantage of the formats you're adding.

I think GL_EXT_PACKED_DEPTH_STENCIL should be used for stencil/depth..