fdprintf() does not exist in 64-bit bionic.

diff -u -r ../busybox-1.24.1/include/platform.h ./include/platform.h
--- ../busybox-1.24.1/include/platform.h	2015-07-12 22:18:47.000000000 -0400
+++ ./include/platform.h	2015-11-26 16:14:37.061610995 -0500
@@ -480,7 +480,7 @@
 #endif
 
 #if defined(ANDROID) || defined(__ANDROID__)
-# if __ANDROID_API__ < 8
+# if __ANDROID_API__ < 8 || defined(__LP64__)
 #  undef HAVE_DPRINTF
 # else
 #  define dprintf fdprintf