build script: remove compilation support for VLCKit
build script: remove compilation support for VLCKit

The option to provide a VLCKit path is retained so the user can provide
a custom binary for use. Note that a xcframework is expected.

Fixes #22

TheHungryBu/MediaLibraryKit,TheHungryBu/MediaLibraryKit,TheHungryBu/MediaLibraryKit,TheHungryBu/MediaLibraryKit