Duplicate Member in NSMenuItemCell.h

[Ted Howard]

When I try to compile gui from the trunk, I get a duplicate member error in NSMenuItemCell.h on _backgroundColor.

Upon looking at the code, I noticed that NSButtonCell was recently modified to include a _backgroundColor member.  Since NSMenuItemCell extends NSButtonCell, the _backgroundColor member of NSMenuItemCell should be removed.

I tried this on my machine, and it seems to work fine.  I have attached a patch that does this.

Ted

NSMenuItemCell-duplicate_backgroundColor.patch
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