Avoid defining constants which causes at least dpkg build to think that
sync_file_range(2) is available - which it is not.

diff -u -r /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/fcntl.h ./usr/include/fcntl.h
--- /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/fcntl.h	2014-10-14 22:53:49.000000000 -0400
+++ ./usr/include/fcntl.h	2014-12-16 05:51:38.371338608 -0500
@@ -59,10 +59,6 @@
 #define SPLICE_F_MORE 4
 #define SPLICE_F_GIFT 8
 
-#define SYNC_FILE_RANGE_WAIT_BEFORE 1
-#define SYNC_FILE_RANGE_WRITE 2
-#define SYNC_FILE_RANGE_WAIT_AFTER 4
-
 extern int creat(const char*, mode_t);
 extern int creat64(const char*, mode_t);
 extern int fallocate64(int, int, off64_t, off64_t);