Use gcc -ansi -pedantic in 9c. Fix many non-C89-isms.

src/cmd/grap/grap.y

@@ -5,7 +5,7 @@
 #include <string.h>
 #include "grap.h"
 
-//#define	RAND_MAX 32767	/* if your rand() returns bigger, change this too */
+/*#define	RAND_MAX 32767	/* if your rand() returns bigger, change this too */
 
 extern int yylex(void);
 extern int yyparse(void);

src/cmd/grap/main.c

@@ -1,3 +1,4 @@
+#define _BSD_SOURCE 1	/* strdup, mkstemp */
 #include <stdio.h>
 #include <signal.h>
 #include <math.h>