Harden glob: continuations, exceptions, re-entry.

* glob.c (s_exit_point): New static variable.
(errfunc_thunk): Set up a continuation guard frame, so
the error function cannot capture a continuation across
glob's stack frames. Intercept all unwinding with
a simple unwind block, save the exit point in the
global variable and then stop the unwinding by
setting the unwind frame's exit point to null.
(glob_wrap): Check for glob being re-entered and
throw error if so. If the glob callback bailed due
to unwinding (as seen by a non-null value in the
exit point global variable), clean up the glob memory
with globfree and continue the unwinding to the
exit point.

unwind.h (uw_curr_exit_point): New macro for accessing
saved exit point in pure unwind frame.

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