Update to latest jacoco usage

Bug: 36792868
Test: EMMA_INSTRUMENT_STATIC=true m -j

Change-Id: I419b543283b52be9a72f5c6b10e4cbea68782174
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 1097855..64f067e 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -85,6 +85,8 @@
 LOCAL_FORCE_STATIC_EXECUTABLE:=
 LOCAL_FULL_LIBS_MANIFEST_FILES:=
 LOCAL_FULL_MANIFEST_FILE:=
+LOCAL_FULL_CLASSES_JACOCO_JAR:=
+LOCAL_FULL_CLASSES_PRE_JACOCO_JAR:=
 LOCAL_GCNO_FILES:=
 LOCAL_GENERATED_SOURCES:=
 # Group static libraries with "-Wl,--start-group" and "-Wl,--end-group" when linking.