winemac: Implement GetDeviceGammaRamp() and SetDeviceGammaRamp().

[Ken Thomases]

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dlls/winemac.drv/display.c |  131 ++++++++++++++++++++++++++++++++++++++++++++
dlls/winemac.drv/gdi.c     |    4 +-
dlls/winemac.drv/macdrv.h  |    2 +
3 files changed, 135 insertions(+), 2 deletions(-)

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