Cleanup verify headers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/mmap.c b/engines/mmap.c
index 2a341d0..fde68f1 100644
--- a/engines/mmap.c
+++ b/engines/mmap.c
@@ -12,6 +12,7 @@
 #include <sys/mman.h>
 
 #include "../fio.h"
+#include "../verify.h"
 
 /*
  * Limits us to 2GB of mapped files in total