Add LOCAL_ADDITIONAL_CHECKED_MODULE

Adding an intermediate file to LOCAL_ADDITIONAL_CHECKED_MODULE will
cause the file to be built for m <module name>, mma, or m checkbuild.

Test: m checkbuild
Change-Id: I2b7c3c8f01960ce2f9176c8a2108f759fd8fc704
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index e190916..3b207e0 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -10,6 +10,7 @@
 LOCAL_AAPT_INCLUDE_ALL_RESOURCES:=
 LOCAL_AAPT_NAMESPACES:=
 LOCAL_ADDITIONAL_CERTIFICATES:=
+LOCAL_ADDITIONAL_CHECKED_MODULE:=
 LOCAL_ADDITIONAL_DEPENDENCIES:=
 LOCAL_ADDITIONAL_HTML_DIR:=
 LOCAL_ADDITIONAL_JAVA_DIR:=