Code review comment for lp:~jelmer/bzr/direct-cstringio-import

Yeah, this is the change I was thinking of, but would retarget to 2.3 as it's safe and that's the version being used by the reporter. For trunk, we want the full fix of changing lazy imports to be less thread-ignorant, as in:

<https://code.launchpad.net/~gagern/bzr/bug396819-lazy_import-threadsafe/+merge/73475>