Preparation for lexical macros: we need to pass a macro

environment down through the expander call hierarchy.

* eval.c (expand_opt_params, expand_params, expand_tree_cases,
expand_tree_case, expand_forms, val expand_cond_pairs, val
expand_place, expand_qquote, expand_vars, expand_quasi, expand_op,
expand_catch_clause, expand_catch, expand): All expanders get new
parameter, menv. expand_forms and expand handle a nil value of menv.
(eval_intrinsic): Pass nil macro environment to expand.
(eval_init): Update intrinsic registration for expand.

* eval.h (expand, expand_forms): Declarations updated.

* parser.y (expand_meta): Gets macro env parameter.
(elem, o_elem, exprs, expr): Pass nil to expand_forms and expand_meta.

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