winemac: Ignore Cocoa child windows which aren't instances of WineWindow.

[Ken Thomases]

On Yosemite, in full-screen mode, Cocoa adds child windows of its own to our
windows.  These windows are, of course, not instances of WineWindow.  So, when
we call WineWindow-specific methods on them, it throws exceptions.
---
dlls/winemac.drv/cocoa_window.m | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)

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