add key.c to compile

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1025 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/mini2440/SConscript

@@ -24,7 +24,7 @@ if rtconfig.RT_USING_RTGUI:
     src_drv += ['touch.c', 'key.c', 'calibration.c']
 
 if rtconfig.RT_USING_FTK:
-    src_drv += ['touch.c']
+    src_drv += ['touch.c', 'key.c']
 
 if rtconfig.RT_USING_RTGUI:
 	if rtconfig.RT_USING_LCD_TYPE == 'PNL_A70':