Add LOCAL_SRCJARS to clear_vars.mk

I064889c9063b642835d9f668e2568b61d0fabe35 added LOCAL_SRCJARS but
forgot to clear it in clear_vars.mk.

Test: m checkbuild
Change-Id: I7d4e6a3821db0eccb25042091aa599cab381a1b0
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index bd605ec..36a4ae9 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -230,6 +230,7 @@
 LOCAL_SOURCE_FILES_ALL_GENERATED:=
 LOCAL_SRC_FILES:=
 LOCAL_SRC_FILES_EXCLUDE:=
+LOCAL_SRCJARS:=
 LOCAL_STATIC_ANDROID_LIBRARIES:=
 LOCAL_STATIC_JAVA_AAR_LIBRARIES:=
 LOCAL_STATIC_JAVA_LIBRARIES:=