winemac: When dragging an undecorated window, keep the title bar vertically within the work area.

[Ken Thomases]

In particular, keep the title bar from moving behind the menu bar or Dock (when
it's on the bottom).
---
dlls/winemac.drv/macdrv.h |   1 +
dlls/winemac.drv/window.c | 225 +++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 225 insertions(+), 1 deletion(-)

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