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Just leaving this here if we want to get this up and running for Cycles - I had ISPC included in the bin/ manifest for some MoonRay experiments as that renderer uses it like a shader compiler, but I kept it out of this PR as it isn't needed to be packaged with Gaffer, only to build OpenImageDenoise.
Realistically it probably would make sense to leave ISPC as a prerequisite for the host's building environment instead of making it a package, open to suggestions...