移除vi头文件路径，头文件仅内部使用

SConscript

@@ -1,9 +1,5 @@
 from building import *
 
-cwd     = GetCurrentDir()
 src     = Glob('*.c')
-CPPPATH = [cwd]
-
-group = DefineGroup('vi', src, depend = ['PKG_USING_VI', 'RT_USING_DFS'], CPPPATH = CPPPATH)
-
+group = DefineGroup('vi', src, depend = ['PKG_USING_VI', 'RT_USING_DFS'])
 Return('group')