Do not output ViewportIndex on SPIR-V if GPU does not support it #3644
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This change remove SPIR-V
ViewportIndex
outputs if the GPU does not support it, in an attempt to support older GPUs. Nothing should change for OpenGL as it does not currently outputgl_ViewportIndex
in GLSL.Testing is welcome, it should not affect newer GPUs (for NVIDIA, it should not affect Maxwell 2nd gen and newer).