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By using meson features we can replace the handcrafted dependency auto-detection by just passing the value from get_option directly to the required arg for dependency, find_library etc. 'auto' features make the dependency optional, 'enabled' requires it while 'disabled' features will skip detection entirely. Any skipped or not found dependency will just be a no-op when passed to build steps and therefore we can also skip the creation of empty vars. The use of skip_deps for these is dropped here as meson provides a way to disable all optional features in one go by passing '-Dauto_features=disabled'.
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