vbscript: Use %define api.pure instead of %pure-parser.

The latter is deprecated and causes warnings.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/vbscript/parser.y

@@ -85,7 +85,7 @@ static statement_t *link_statements(statement_t*,statement_t*);
 
 %lex-param { parser_ctx_t *ctx }
 %parse-param { parser_ctx_t *ctx }
-%pure-parser
+%define api.pure
 %start Program
 
 %union {