[Webkit-unassigned] [Bug 214338] Add some missing boilerplate to help fix build on macOS Big Sur

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214338

--- Comment #3 from Saagar Jha <saagar at saagarjha.com> ---
Yeah, I'm just guessing these from looking at AppKit's symbol table, so they might differ from the actual internal header. -[NSAppearance _setUsesMetricsAppearance:] does exist on my system and sets the same ivar that -[NSAppearance _usesMetricsAppearance] accesses, and it isn't packed into a bitfield like many IPI flags are, so I figured that its setter might be exposed as SPI. I'll fix that and the nullability annotation and put up another patch.

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