[simulator] 消除vs下的警告

bsp/simulator/drivers/SConscript

@@ -8,8 +8,6 @@ LIBS = []
 LIBPATH = []
 CPPPATH = [cwd]
 
-CPPDEFINES = ['_CRT_DECLARE_NONSTDC_NAMES=0'] # avoid to conflict with the inherent STDC in VS
-
 # remove no need file.
 if GetDepend('PKG_USING_GUIENGINE') == False:
     SrcRemove(src, 'sdl_fb.c')
@@ -32,8 +30,7 @@ if GetDepend('RT_USING_DFS') == False or GetDepend('RT_USING_MODULE') == False:
 if sys.platform[0:5]=="linux": #check whether under linux
     SrcRemove(src, ['module_win32.c', 'dfs_win32.c'])
 
-group = DefineGroup('Drivers', src, depend = [''],
-                    CPPPATH = CPPPATH, LIBS=LIBS, LIBPATH=LIBPATH, CPPDEFINES = CPPDEFINES)
+group = DefineGroup('Drivers', src, depend = [''], CPPPATH = CPPPATH, LIBS=LIBS, LIBPATH=LIBPATH)
 
 list = os.listdir(cwd)
 for item in list: