Remove #define _STDIO_UTILITY, can't find any use of it

libc/stdio/scanf.c

@@ -46,7 +46,6 @@
 
 #define _ISOC99_SOURCE			/* for LLONG_MAX primarily... */
 #define _GNU_SOURCE
-#define _STDIO_UTILITY
 #include <features.h>
 #include "_stdio.h"
 #include <stdlib.h>

libc/stdio/vfprintf.c

@@ -91,7 +91,6 @@
 
 #define _ISOC99_SOURCE			/* for ULLONG primarily... */
 #define _GNU_SOURCE
-#define _STDIO_UTILITY			/* We're using _uintmaxtostr. */
 #include <features.h>
 #include "_stdio.h"
 #include <stdlib.h>

libc/string/i386/string.c

@@ -22,7 +22,6 @@
  *  -Erik
  */
 
-#define _STDIO_UTILITY
 #define _GNU_SOURCE
 #include <string.h>
 #include <locale.h> /* for __LOCALE_C_ONLY */

libc/string/powerpc/string.c

@@ -26,7 +26,6 @@
  * Copyright (C) 2004 Joakim Tjernlund
  */
 
-#define _STDIO_UTILITY
 #define _GNU_SOURCE
 #include <string.h>
 #include <locale.h> /* for __LOCALE_C_ONLY */