android: add byteorder for the swab routines

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/os/os-android.h b/os/os-android.h
index b844982..df22333 100644
--- a/os/os-android.h
+++ b/os/os-android.h
@@ -13,6 +13,7 @@
 #include <sched.h>
 #include <linux/unistd.h>
 #include <linux/major.h>
+#include <asm/byteorder.h>
 
 #include "binject.h"
 #include "../file.h"