exceptions: use uw_rthrow for non-error exceptions.

* eval.c (eval_exception): This function is shared by warnings
and errors. Use uw_throw. The eval_error caller already has
an abort() after its eval_exception call, which makes that
code path continue to be equivalent to uw_throw. The behavior
changes for the other caller, eval_warn, which will now return
if the warning is not handled.
(eval_defr_warn, gather_free_refs, gather_free_refs_nw): Throw
non-error exception with uw_rthrow.

* match.c (v_throw, v_assert, h_assert): Use uw_rthrow for these
directives, just like the throw function.

* parser.c (repl_intr, repl_warning): Use uw_rthrow.

* unwind.c (uw_muffle_warning, uw_release_deferred_warnings):
Likewise.

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