Use the droidcore goal with dist-for-goals.

Change-Id: Ie0042028c4a33a23a4eb9aed1d1015e580c3e168
diff --git a/common/Android.mk b/common/Android.mk
index 1f78840..269ac5a 100644
--- a/common/Android.mk
+++ b/common/Android.mk
@@ -26,7 +26,7 @@
 include $(BUILD_STATIC_JAVA_LIBRARY)
 
 # Include this library in the build server's output directory
-$(call dist-for-goals, droid, $(LOCAL_BUILT_MODULE):android-common.jar)
+$(call dist-for-goals, droidcore, $(LOCAL_BUILT_MODULE):android-common.jar)
 
 # Build the test package
 include $(call all-makefiles-under, $(LOCAL_PATH))