@(output): bugfix: lazy evaluation doesn't work.

In an @(output), if we reference a variable bound to a lazy
list, and the generation of that logic references TXR pattern
variables, things break: the lazy list's code doesn't see
the binding. This is because the lazy list is forced by some
logic that doesn't establish the proper environment for
that evaluation. Inside a @(repeat), the do_output function
measures the lengths of lists emanating from variables,
and that has the effect of forcing the lazy lists.

* match.c (v_output): Just set up the dynamic environment
around the entire function, so that any Lisp evaluation that
occurs is happening as if it were via tleval.

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