This is a patch addressing several features to improve Ark's Mac integration:
- allow opening files from LaunchServices (the Finder, the open commandline utility etc)
- prevent replacing the embedded app icon with the result of a failed lookup-from-theme
- ported PluginManager::libarchiveHasLzo()
Ideally the toplevel CMake file should check the clang version being used; the build fails for me with AppleClang 600 (= clang 3.5).