JUCE 7.0.10: cp vs ln in Xcode project

[t0m]

VST/AU builds fail after upgrading to Xcode 15

This wasn’t intended to be a breaking change, and there is a surprising amount of complexity involved in this process. Changes to Xcode are limiting our options. Unfortunately a different deliberate breaking change may be required, but we’ll communicate this if so. We’re working on a fix now.