Add UnrollXYZFloatTo16 input formatter for TYPE_XYZ_FLT.
Add UnrollXYZFloatTo16 input formatter for TYPE_XYZ_FLT.

Transforms created with TYPE_XYZ_FLT would otherwise result in XYZ
values that were off (too small) by a factor of 2.

This change fixes the testbed based on my last commit.

Enseed/lcms2,mindw/little-CMS-cmake,Enseed/lcms2,mindw/little-CMS-cmake,mindw/little-CMS-cmake,Enseed/lcms2