[PATCH 0/1] MR9372: winemac.drv: Explicitly add an ivar for contentViewMaskLayer.

[Tim Clem (＠tclem)]

Required for @synthesize when building with older compilers.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58916

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9372