Code review comment for lp://qastaging/~afrantzis/mir/fix-1513901-shutdown-crash-with-mesa-kms

> keep_library_alive=mir::detail::RefCountedLibrary(reinterpret_cast<void*>(&create_host_platform))]

This what I tried first (although I used a shared_ptr<> backed by mir::UniqueModulePtr<int> as the keep_alive object) but it didn't have the desired result. I also tried your proposal (RefCountedLibrary) a moment ago without success either.