BuildSettingCondition should offer a Mac Catalyst condition (amend)
BuildSettingCondition should offer a Mac Catalyst condition (amend)

We also need Mac Catalyst to fall back to iOS in PackageBuilder

rdar://60376383

apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager