Sync io_uring with 5.6

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/src/include/liburing/io_uring.h b/src/include/liburing/io_uring.h
index ea23136..ef84065 100644
--- a/src/include/liburing/io_uring.h
+++ b/src/include/liburing/io_uring.h
@@ -75,6 +75,8 @@
 #define IORING_OP_ASYNC_CANCEL	14
 #define IORING_OP_LINK_TIMEOUT	15
 #define IORING_OP_CONNECT	16
+#define IORING_OP_FILES_UPDATE	17
+#define IORING_OP_FALLOCATE	18
 
 /*
  * sqe->fsync_flags