message: Add workaround for Adreno Vulkan shader bug.
  Fixes
diff: #define DITHERING_TRIANGLE_NOISE 3
  #define DITHERING_TRIANGLE_NOISE_RGB 4
  -#ifdef TARGET_MOBILE
  +// Workaround Adreno bug #1096 by using VLACHOS for Vulkan.
  +#if defined(TARGET_MOBILE) && !defined(TARGET_VULKAN_ENVIRONMENT)
  #define DITHERING_OPERATOR DITHERING_INTERLEAVED_NOISE
  #else
  #define DITHERING_OPERATOR DITHERING_VLACHOS
  