winemac: Send WM_{ENTER, EXIT}SIZEMOVE around window frame changes initiated by Cocoa.

[Ken Thomases]

The Mac driver was already sending these events when the user resizes the
window by dragging its corner/edges, but there are other occasions when the
window frame changes.  For example, when the user zooms the window.

Some programs (e.g. Terraria) fail to adjust their rendering unless they
get these events.
---
dlls/winemac.drv/cocoa_window.m | 1 +
dlls/winemac.drv/macdrv_cocoa.h | 1 +
dlls/winemac.drv/window.c       | 6 ++++++
3 files changed, 8 insertions(+)

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