expander: expand must only ignores unbound warnings.

The expand function must not muffle all deferred warnings.
That causes the problem that a form like (inc var a.bar) fails
to produce a warning due to bar not being the slot of any
structure. The expand function must only muffle warnings about
undefined functions and variables.

* eval.c (muffle_unbound_warning): New static function.
(no_warn_expand): Use muffle_unbound_warning as handler,
rather than uw_muffle_warning.

* tests/012/struct.tl: Fix two test cases here which test the
expand function using a form that references a nonexistent
slot. These now generate a warning, so we use the slot name b
rather than d, which is defined.

* txr.1: Documented change to expand.

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