matcher: reimplementation of lambda-match.

This patch replaces the argument-list-based lambda match with
one that matches fixed arguments without consing. Instead of
generating a variadic function with zero fixed arguments, it
generates a function with required, optional and rest argument
based on considering the arity of all the matches.

* share/txr/stdlib/match.tl (compile-exprs-match): New
function.
(compile-match): Wire a new pattern operator called sys:exprs,
for internal use. This matches a list-like pattern against the
values of multiple expressions, rather than a single
expression.
(when-exprs-mach): New internal macro for matching a sequence
of patterns against a sequence of expressions of the same
arity.
(lambda-clause): New structure.
(parse-lambda-match-clause, expand-lambda-match): New functions.
(lambda-match, defun-match): Redefine using
expand-lambda-match.

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