Pass arch/os in probe

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.h b/server.h
index e9a6a37..c6e9ce2 100644
--- a/server.h
+++ b/server.h
@@ -63,6 +63,8 @@
 	uint8_t fio_major;
 	uint8_t fio_minor;
 	uint8_t fio_patch;
+	uint8_t os;
+	uint8_t arch;
 };
 
 struct cmd_line_pdu {