The SDK is relevant for all Apple systems, including macOS, iOS, tvOS,
watchOS, and visionOS.
We still pick up -DQT_UIKIT_SDK for iOS for compatibility.
[ChangeLog][CMake] The -sdk configure argument now maps
to the QT_APPLE_SDK CMake variable. QT_UIKIT_SDK is still
supported for iOS builds for compatibility.
Change-Id: I983a2f23c2414eb73cd35bb83738088defb45cbd
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>