use "glibc errno" trick not only for ash, but for entire busybox

(add/remove: 1/1 grow/shrink: 37/37 up/down: 139/-228)        Total: -89 bytes

libbb/safe_write.c

@@ -7,13 +7,8 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <stdio.h>
-#include <errno.h>
-#include <unistd.h>
 #include "libbb.h"
 
-
-
 ssize_t safe_write(int fd, const void *buf, size_t count)
 {
 	ssize_t n;