winemac: Track drawn surface rect to reduce black flicker for new or resized windows.

[Ken Thomases]

Technically, there's still flicker but it's off-white window background color,
which is less visibly noticeable.
---
dlls/winemac.drv/macdrv.h  |   12 +++++++++++-
dlls/winemac.drv/surface.c |   16 ++++++++++++++--
dlls/winemac.drv/window.c  |   17 ++---------------
3 files changed, 27 insertions(+), 18 deletions(-)

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