update the rtconfig.py and SConstruct in the BSP

in order to use buildbot.py

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2028 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/ls1bdev/SConstruct

@@ -6,6 +6,7 @@ if os.getenv('RTT_ROOT'):
     RTT_ROOT = os.getenv('RTT_ROOT')
 else:
     RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *