修改python 空格和tab混用的问题；

bsp/stm32/stm32f767-fire-challenger/rtconfig.py

@@ -22,8 +22,8 @@ elif CROSS_TOOL == 'keil':
     PLATFORM 	= 'armcc'
     EXEC_PATH 	= r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
-	PLATFORM 	= 'iar'
-	EXEC_PATH 	= r'C:/Program Files (x86)/IAR Systems/Embedded Workbench 8.0'
+    PLATFORM 	= 'iar'
+    EXEC_PATH 	= r'C:/Program Files (x86)/IAR Systems/Embedded Workbench 8.0'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
@@ -88,7 +88,7 @@ elif PLATFORM == 'armcc':
     else:
         CFLAGS += ' -O2'
 
-    CXXFLAGS = CFLAGS 
+    CXXFLAGS = CFLAGS
     CFLAGS += ' -std=c99'
 
     POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'
@@ -138,7 +138,7 @@ elif PLATFORM == 'iar':
     LFLAGS += ' --entry __iar_program_start'
 
     CXXFLAGS = CFLAGS
-    
+
     EXEC_PATH = EXEC_PATH + '/arm/bin/'
     POST_ACTION = 'ielftool --bin $TARGET rtthread.bin'