update SConscript 判断 C++ 功能是否开启

Signed-off-by: yangfasheng <yangfasheng@rt-thread.com>

examples/ImportCplusplus/SConscript

@@ -6,6 +6,6 @@ src = Glob('*.cpp')
 
 CPPPATH = [cwd]
 
-group = DefineGroup('JerryScript', src, depend = ['PKG_USING_JERRYSCRIPT'], CPPPATH = CPPPATH)
+group = DefineGroup('JerryScript', src, depend = ['PKG_USING_JERRYSCRIPT', 'RT_USING_CPLUSPLUS'], CPPPATH = CPPPATH)
 
 Return('group')