Patch: classic mac gamma ramps

This patch against SDL12 CVS uses Apple’s “MacGamma” sample code to
enable setting/getting the gamma ramps in classic Mac toolbox and
DrawSprocket video drivers.

mac-gamma-ramp.patch applies in src/video
MacGamma.h/.cpp go in src/video/maccommon

I only have CW 10 here, so I could not update the old CodeWarrior or
MPW projects; all that is needed is the addition of MacGamma.cpp to
the video/maccommon folder

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