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yacc: define dummy yytokname() and yystatname() macros if not yydebug

--- a/sys/lib/yaccpar

+++ b/sys/lib/yaccpar

@@ -4,20 +4,7 @@

 #ifdef	yydebug

 #include	"y.debug"

-#else

-#define	yydebug		0

-char*	yytoknames[1];		/* for debugging */

-char*	yystates[1];		/* for debugging */

-#endif

-/*	parser for yacc output	*/

-

-int	yynerrs = 0;		/* number of errors */

-int	yyerrflag = 0;		/* error recovery flag */

-

-extern	int	fprint(int, char*, ...);

-extern	int	sprint(char*, char*, ...);

-

 char*

 yytokname(int yyc)

 {

@@ -41,6 +28,17 @@

 	sprint(x, "<%d>\n", yys);

 	return x;

 }

+#else

+#define	yydebug		0

+#define yytokname(x)	""

+#define yystatname(x)	""

+#endif

+

+/*	parser for yacc output	*/

+

+int	yynerrs = 0;		/* number of errors */

+int	yyerrflag = 0;		/* error recovery flag */

+

 long

 yylex1(void)