Get Berkeley Yacc port of the parser working again.

* parser.y (byacc_fool): New grammar nonterminal symbol and
dummy rule set.
(spec): Use dummy byacc_fool to create a fake continuation
in the grammar, so the Berkeley-Yacc-generated parser doesn't
throw a syntax error. Our YYACCEPT prevents the byacc_fool part
from consuming more than one token of lookahead.
Bison doesn't need this because it has $default actions which reduce
regardless of the lookahead token. BYacc insists on reducing only
if it can match $end (end of input), and not other tokens, which
constitute syntax errors.

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