Add LOCAL_CTS_GTEST_LIST_EXECUTABLE

Change-Id: I9bca66d0e0ef25264b6576d907fa57997e62e8c1
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 7304bf8..865fac9 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -344,6 +344,7 @@
 LOCAL_INIT_RC_32:=
 LOCAL_INIT_RC_64:=
 LOCAL_JAVA_LANGUAGE_VERSION:=
+LOCAL_CTS_GTEST_LIST_EXECUTABLE:=
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.