shlib versions changed on some archs

[Roland McGrath]

This is something we thought might be an issue when I first made the
change, but we noticed libpthread et al have minima specified already and
we overlooked libthread_db.  I have changed the generation now so that
DEFAULT lines will work regardless of the order.

If only libthread_db was actually affected, then I don't think there will
be any ABI compatibility issue in actual practice.  libthread_db is
normally used only with dlopen/dlsym rather than direct linking, and
versioned symbol lookups (dlvsym) are not normally used.  (Certainly there
will be no problem with gdb.)



Thanks,
Roland