Add c_std and cpp_std properties.

Test: Checked showcommands ouput for each setting.
Bug: None
Change-Id: Ibc25f3977eaaecfd1fb99a27c9e15acae0ec4106
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 6e61d15..02e574f 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -224,6 +224,8 @@
 LOCAL_WARNINGS_ENABLE:=
 LOCAL_WHOLE_STATIC_LIBRARIES:=
 LOCAL_YACCFLAGS:=
+LOCAL_C_STD:=
+LOCAL_CPP_STD:=
 OVERRIDE_BUILT_MODULE_PATH:=
 
 # arch specific variables