winemac: When ClipCursor() is called redundantly, don't warp the cursor or discard mouse move events.

[Ken Thomases]

Fixes a problem in some games which repeatedly (re)establish the same cursor
clipping rect, making it exceedingly difficult to move the camera with the
mouse.
---
dlls/winemac.drv/cocoa_app.m | 4 ++++
1 file changed, 4 insertions(+)

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