Add option to disable fadvise() hints

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index c34c00c..d0629ec 100644
--- a/fio.h
+++ b/fio.h
@@ -386,6 +386,7 @@
 	unsigned int nice;
 	unsigned int file_service_type;
 	unsigned int group_reporting;
+	unsigned int fadvise_hint;
 
 	char *read_iolog_file;
 	char *write_iolog_file;