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C++ standard defines arrays

C++ standard defines arrays as dense arrays, no spacing or extra rows padding.

Also, because xtrans/_abs arrays are defined in LibRaw class definition, and it is possible that we compile two source files with different -O.. switches, array layout should not changed from -O0 (no warning) to -O2 (warning issued).
So, I think this is gcc problem: it should either show this warning with any -O.. setting, or do not show it with -O2

Anyway, this loop was already changed to to 6-wide loops in master branch with commit message 'to make gcc happy' :)

-- Alex Tutubalin @LibRaw LLC