add LOCAL_PREBUILT_STRIP_COMMENTS to clear_vars.mk
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 031bc0b..28044c4 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -47,6 +47,7 @@
 LOCAL_PREBUILT_EXECUTABLES:=
 LOCAL_PREBUILT_JAVA_LIBRARIES:=
 LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES:=
+LOCAL_PREBUILT_STRIP_COMMENTS:=
 LOCAL_INTERMEDIATE_SOURCES:=
 LOCAL_JAVA_LIBRARIES:=
 LOCAL_NO_STANDARD_LIBRARIES:=