[PATCH 0/1] MR546: vkd3d-shader/spirv: Enable capability ShaderViewportIndexLayerEXT when needed.

[Giovanni Mascellani (＠giomasce)]

Capability Geometry allows to use the Layer builtin in geometry shaders.
For vertex shaders ShaderLayer should be used, but it's only available
starting from SPIR-V 1.5. ShaderViewportIndexLayerEXT can be used instead
with extension SPV_EXT_shader_viewport_index_layer.