Add terse version output format command line parameter

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/fio.h b/fio.h
index 6eb270d..e93e8f3 100644
--- a/fio.h
+++ b/fio.h
@@ -648,6 +648,7 @@
 extern int fio_gtod_cpu;
 extern enum fio_cs fio_clock_source;
 extern int warnings_fatal;
+extern int terse_version;
 
 extern struct thread_data *threads;