Use Jack to check build

Run jack with no outputs as a quick check for compilation errors and use
a timestamp to store that check was made.

Bug: 19069325

(cherry picked from commit 43084d9f49a994a7eaebd3c94758d0ebf4c74b6e)

Change-Id: I9b84b503b28cfdfa245f91da0061ee3a79386b28
diff --git a/core/package_internal.mk b/core/package_internal.mk
index 097d801..8dd1f00 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -304,6 +304,7 @@
 endif
 ifneq ($(full_classes_jack),)
 $(full_classes_jack): $(R_file_stamp)
+$(jack_check_timestamp): $(R_file_stamp)
 endif
 endif # LOCAL_JACK_ENABLED