Remove Apple Bitcode support

Apple has deprecated Bitcode support in XCode 14 with a loud warning
asking users to stop using it, and submissions to the App Store now
strip bitcode information. Time to just delete all the relevant code.

https://developer.apple.com/documentation/xcode-release-notes/xcode-14-release-notes#Deprecations

Part-of: <gstreamer/cerbero!879>
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