[bsp]stm32f103-dofly-lyc8 default build by release mode

Author: Guozhanxin

bsp/stm32/stm32f103-dofly-lyc8/rtconfig.py

@@ -28,7 +28,8 @@
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
-BUILD = 'debug'
+# BUILD = 'debug'
+BUILD = 'release'
 
 if PLATFORM == 'gcc':
     # toolchains