[bug #35263] libobjc2 can enter a deadlock during dtable initialization

[Richard Frith-Macdonald]

Follow-up Comment #8, bug #35263 (project gnustep):

>  If you only got the global lock, you have to make sure that every single
class that might potentially receive messages in another thread is initialized
before you go multi-threaded,

On the contrary ... with the gnu runtime all you have to do is avoid any
+initialize waiting for another thread ... which is a *very* easy contract to
honor.

But the discussion of which contract is *easier* is rather academic ... in
practice we have to try to honor both contracts :-(

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