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fix maketab non-bug

--- a/FIXES

+++ b/FIXES

@@ -25,6 +25,11 @@

 This file lists all bug fixes, changes, etc., made since the AWK book

 was sent to the printers in August, 1987.

+Oct 25, 2018:

+	Added test in maketab.c to prevent generating a proctab entry

+	for YYSTYPE_IS_DEFINED.  It was harmless but some gcc settings

+	generated a warning message.  Thanks to Nan Xiao for report.

+

 Aug 27, 2018:

 	Disallow '$' in printf formats; arguments evaluated in order

 	and printed in order.

--- a/makefile

+++ b/makefile

@@ -34,8 +34,8 @@

 # yacc options.  pick one; this varies a lot by system.

 #YFLAGS = -d -S

-#YACC = bison -d -y

-YACC = yacc -d

+YACC = bison -d -y

+#YACC = yacc -d

 #		-S uses sprintf in yacc parser instead of sprint

 OFILES = b.o main.o parse.o proctab.o tran.o lib.o run.o lex.o

--- a/maketab.c

+++ b/maketab.c

@@ -135,6 +135,8 @@

 		n = sscanf(buf, "%1c %s %s %d", &c, def, name, &tok);

 		if (c != '#' || (n != 4 && strcmp(def,"define") != 0))	/* not a valid #define */

 			continue;

+		if (strcmp(name, "YYSTYPE_IS_DECLARED") == 0)

+			continue;

 		if (tok < FIRSTTOKEN || tok > LASTTOKEN) {

 			/* fprintf(stderr, "maketab funny token %d %s ignored\n", tok, buf); */

 			continue;

-- 

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