The x86/x86-64 SIMD extensions were originally designed to accommodate changing the value of RGB_*, but this apparently broke when RGB-to-gray colorspace conversion was accelerated.  Further, the ARM NEON extensions have always assumed that JCS_RGB behaves identically to JCS_EXT_RGB.  Rather than fix these issues, it makes more sense to just stop claiming that we support changing the values of RGB_*, since doing so is no longer necessary.
The x86/x86-64 SIMD extensions were originally designed to accommodate changing the value of RGB_*, but this apparently broke when RGB-to-gray colorspace conversion was accelerated.  Further, the ARM NEON extensions have always assumed that JCS_RGB behaves identically to JCS_EXT_RGB.  Rather than fix these issues, it makes more sense to just stop claiming that we support changing the values of RGB_*, since doing so is no longer necessary.



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