Fix AVFoundation in Xcode 12 beta 3

If you’re encountering the error AVAudioSesson is unavailable on macOS on Xcode 12 beta 3, you can manually fix this as follows.

Look in /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/swift/AVFoundation.swiftmodule. Open the files:

• arm64e-apple-macos.swiftinterface
• x86_64-apple-macos.swiftinterface

Change both occurrences of:

@available(iOS 7.0, watchOS 2.0, tvOS 9.0, *)
extension AVAudioSession.Location {

to:

@available(OSX, unavailable)
@available(iOS 7.0, watchOS 2.0, tvOS 9.0, *)
extension AVAudioSession.Location {

I’m expecting there will be another beta soon which fixes this.cd ../..