Add LOCAL_CLANG_*FLAGS for clang only flags.

To be used only for some modules.

Change-Id: I107ec37f11f738f860598f0c86c4ad7ec20c9011
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index be73c0d..34cd164 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -45,11 +45,15 @@
 LOCAL_ASFLAGS:=
 LOCAL_CFLAGS:=
 LOCAL_CPPFLAGS:=
+LOCAL_CLANG_ASFLAGS:=
+LOCAL_CLANG_CFLAGS:=
+LOCAL_CLANG_CPPFLAGS:=
 LOCAL_CONLYFLAGS:=
 LOCAL_RTTI_FLAG:=
 LOCAL_C_INCLUDES:=
 LOCAL_EXPORT_C_INCLUDE_DIRS:=
 LOCAL_LDFLAGS:=
+LOCAL_CLANG_LDFLAGS:=
 LOCAL_LDLIBS:=
 LOCAL_AAPT_FLAGS:=
 LOCAL_AAPT_INCLUDE_ALL_RESOURCES:=