Factor out excessive uw_set_match_context calls.

We only need to stash the TXR matcher's context in an
environment frame when there is the possibility that
Lisp code may be called, or filters which re-enter
the matcher directly or through Lisp code.

* match.c (eval_with_bindings, eval_progn_with_bindings): New
static functions.
(dest_bind): Use eval_with_bindings instead of five lines
of boilerplate code.
(h_chr): No need to stash context around dest_bind;
lower levels take care of it.
(subst_vars): Do set up match context around the body
of this function, for the sake of Lisp calls and filtering
in format_field. Use eval_with_bindings.
(do_txeval): Remove match context environment frame setup
around subst_vars.  Use eval_with_bindings, too.
(do_output_line): Use eval_with_bindings.
(v_output): No match context environment frame around
do_output.
(v_do, v_require): Use eval_progn_with_bindings instead of
five line boilerplate.
(v_line): No match context frame around dest_bind.
(h_do): Use eval_progn_with_bindings.

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