Remove bitcode support, as is now deprecated by Apple

[misl6]

From https://developer.apple.com/documentation/Xcode-Release-Notes/xcode-14-release-notes#Deprecations:

Starting with Xcode 14, bitcode is no longer required for watchOS and tvOS applications, and the App Store no longer accepts bitcode submissions from Xcode 14.
Xcode no longer builds bitcode by default and generates a warning message if a project explicitly enables bitcode: “Building with bitcode is deprecated. Please update your project and/or target settings to disable bitcode.” The capability to build with bitcode will be removed in a future Xcode release. IPAs that contain bitcode will have the bitcode stripped before being submitted to the App Store. Debug symbols can only be downloaded from App Store Connect / TestFlight for existing bitcode submissions and are no longer available for submissions made with Xcode 14. (86118779)

Latest XCode version is now 15.2, and bitcode make integration with other libraries more complex (e.g. ANGLE, which is coming soon)

This PR completely removes bitcode support.