Code review comment for lp://qastaging/~afrantzis/mir/fix-1358191-connect-segv-spike

Well, I do actually use the unloadability in https://code.launchpad.net/~raof/mir/privatise-all-the-things/+merge/228796 - we load everything to probe it, and then want to unload the platforms that didn't probe.

Hm. Having said that, just making the unload explicit would be fine - the only time we need to unload things is in the location that we open them, so reference-counted SharedLibraries aren't a big win.