Move variables to backend, fix up line spaces

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/libfio.c b/libfio.c
index cb917ce..76a36a6 100644
--- a/libfio.c
+++ b/libfio.c
@@ -25,6 +25,15 @@
 #include <string.h>
 #include "fio.h"
 
+/*
+ * Just expose an empty list, if the OS does not support disk util stats
+ */
+#ifndef FIO_HAVE_DISK_UTIL
+FLIST_HEAD(disk_list);
+#endif
+
+unsigned long arch_flags = 0;
+
 static const char *fio_os_strings[os_nr] = {
 	"Invalid",
 	"Linux",