winemac: Add registry setting to control setting display gamma ramp.

[Ken Thomases]

---
dlls/winemac.drv/display.c     |    6 ++++++
dlls/winemac.drv/macdrv.h      |    1 +
dlls/winemac.drv/macdrv_main.c |    4 ++++
3 files changed, 11 insertions(+), 0 deletions(-)

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