winemac: Fix conversion of empty RECT to an empty CGRect.

[Ken Thomases]

For some empty RECTs, such as { INT_MAX, INT_MAX, INT_MIN, INT_MIN }, right
minus left or bottom minus top underflow and wrap around to positive values.
---
dlls/winemac.drv/macdrv.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

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