fallocate64() is already defined in <fcntl.h> for android-21

diff -u -r ../transmission-2.84/libtransmission/fdlimit.c ./libtransmission/fdlimit.c
--- ../transmission-2.84/libtransmission/fdlimit.c	2014-07-01 13:08:59.298910687 -0400
+++ ./libtransmission/fdlimit.c	2014-12-20 05:47:58.563577502 -0500
@@ -22,7 +22,7 @@
  #include <fcntl.h>
 #endif
 
-#ifdef HAVE_FALLOCATE64
+#if defined HAVE_FALLOCATE64 && !(defined __ANDROID__)
   /* FIXME can't find the right #include voodoo to pick up the declaration.. */
   extern int fallocate64 (int fd, int mode, uint64_t offset, uint64_t len);
 #endif