Fix build by defining MAX() macro here.

lib/libstand/printf.c

@@ -151,6 +151,7 @@ ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
 static int
 kvprintf(char const *fmt, void (*func)(int), void *arg, int radix, va_list ap)
 {
+#define	MAX(a, b) (((a) > (b)) ? (a) : (b))
 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc); else *d++ = cc; retval++; }
 	char nbuf[MAXNBUF];
 	char *d;