Add alignment to thread_options_pack for proper fp alignment

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/server.h b/server.h
index 67ba38d..46d05a6 100644
--- a/server.h
+++ b/server.h
@@ -38,7 +38,7 @@
 };
 
 enum {
-	FIO_SERVER_VER			= 37,
+	FIO_SERVER_VER			= 38,
 
 	FIO_SERVER_MAX_FRAGMENT_PDU	= 1024,
 	FIO_SERVER_MAX_CMD_MB		= 2048,