Blender Git Loki

Fix T74964: Stereo Viewport Rendering Not Working

On some platforms the stereo viewport rendering was not working. The
issue was that the fragment shader and vertex shaded didn't match. Some
platforms will remove the non-matching in/out parameters and blender
needs to provide only the optimal set of parameters. Other platform
still want to receive data for the parameters that aren't used.

This fix uses the correct vertex shader that matches the fragment shader
making both platforms render the same result.