Merge change 5017 into donut

* changes:
  Don't install afar and dexpreopt-wrapper on system while building tests.
diff --git a/tools/dexpreopt/afar/Android.mk b/tools/dexpreopt/afar/Android.mk
index d224675..9f1b987 100644
--- a/tools/dexpreopt/afar/Android.mk
+++ b/tools/dexpreopt/afar/Android.mk
@@ -24,6 +24,6 @@
 LOCAL_SHARED_LIBRARIES := libz
 
 LOCAL_MODULE := afar
-LOCAL_MODULE_TAGS := tests
+LOCAL_MODULE_TAGS := optional
 
 include $(BUILD_EXECUTABLE)
diff --git a/tools/dexpreopt/dexopt-wrapper/Android.mk b/tools/dexpreopt/dexopt-wrapper/Android.mk
index e6ca389..ae2b6a3 100644
--- a/tools/dexpreopt/dexopt-wrapper/Android.mk
+++ b/tools/dexpreopt/dexopt-wrapper/Android.mk
@@ -31,6 +31,6 @@
 
 LOCAL_MODULE := dexopt-wrapper
 
-LOCAL_MODULE_TAGS := tests
+LOCAL_MODULE_TAGS := optional
 
 include $(BUILD_EXECUTABLE)