winemac: Don't use Cocoa parent-child relationship when topmost state is enough to keep owned in front of owner.

[Ken Thomases]

The Cocoa parent-child relationship has undesirable side effects and bugs.  In
the general case, it's the only way to maintain the z-order of owned windows
relative to their owner.  But when the owner is non-topmost and an owned
window is topmost, the Cocoa window level will enforce that and we don't
need it.
---
dlls/winemac.drv/cocoa_window.m |   58 +++++++++++++++++++++++++++++++-------
1 files changed, 47 insertions(+), 11 deletions(-)

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