Revert "Merge generic2D shader into generic" #1486
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This reverts #1483.
This is a loading time regression that causes several useless shader permutations to be built.
With "Merge generic2D shader into generic":
built 241 glsl shaders in 19483 msec
Without it:
built 224 glsl shaders in 18827 msec
The GENERIC_2D macro would need to be removed to merge these without introducing unnecessary permutations.