[Merged by Bors] - Fix PBR regression for unlit materials #2197
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Fixes the frag shader for unlit materials by correcting the scope of the
#ifndef
to include the light functions. Closes #2190, introduced in #2112.Tested by changing materials in the the
3d_scene
example to be unlit. Unsure how to prevent future regressions without creating a test case scene that will catch these runtime panics.