unwind: stop runaway recursion.

Before uw_rthrow calls uw_unwind_to_exit_point, it decrements the
reentry_count, so that function is not protected against
re-entry. We could protect some of its internal code agains
re-entry, like the use of a bad stderr stream, if we extend
the scope of that variable.

* unwind.c (reentry_count): New static variable, moved to file
scope from uw_rthrow function.
(uw_unwind_to_exit_point): Bump up the reentry count in two
places where we print diagnostics and terminate. If the
diagnostic code hits an exception, the uw_rthrow will see
the positive reentry count and abort.

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