[PATCH v2 0/1] MR784: wined3d: Tell vkd3d_shader about dual source blending.

[Stefan Dösinger]

Dual source blending implies an additional shader output, which needs to
be declared. This improves WoT on high graphics settings on MoltenVK.

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  v2: wined3d: Tell vkd3d_shader about dual source blending.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/784