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qt6.qtbase: build with `apple-sdk_15`, propagate `apple-sdk_12`
As of Qt 6.8, the macOS 15 SDK is supported for building, and support for targeting macOS 11 has been dropped. (Another good reason for supporting only 3 to 4 macOS releases.) Previously the build and target SDKs were swapped, probably because the dependency lists are in a confusing order. Move them into a central place to reduce duplication and keep macOS platform support in one prominent location. Fixes: 830b9fe5