Update fio io engine version

The interface didn't really change, but if the engine is using
->setup() then it needs updating. Generally it just needs to
remove any code other than the part setting ->real_file_size.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index 1e63f3b..1b8a66d 100644
--- a/fio.h
+++ b/fio.h
@@ -836,7 +836,7 @@
 	void *dlhandle;
 };
 
-#define FIO_IOOPS_VERSION	6
+#define FIO_IOOPS_VERSION	7
 
 extern struct ioengine_ops *load_ioengine(struct thread_data *, const char *);
 extern void register_ioengine(struct ioengine_ops *);