This PR adds workarounds for platforms that don't support `shaderOutputLayer`
or `shaderOutputViewportIndex`. Some NVIDIA laptop GPUs and ARM GPUs don't
have those device features.
The workaround uses the same approach as OpenGL. A geometry shader is injected
to emulate the feature.
For testing the workarounds they have also been connected to the
`--debug-gpu-force-workarounds` command line argument.
Fixes#113475 by implementing #113529
Pull Request: https://projects.blender.org/blender/blender/pulls/113605
159e798cdb