add build linux

Author: tmori

build_linux/build.bash

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+make clean
+make timer32=true serial_fifo_enable=true vdev_disable=true enable_bt_serial=true skip_clock_bugfix=true supress_detect_error=true etrobo_optimize=true reuse_port=true