Removing from userdebug builds by default.

Change-Id: I5579e96437648193ee1ad1573584e5ec8f5e5ade
diff --git a/cmds/backup/Android.mk b/cmds/backup/Android.mk
index 73af0bc..42e5133 100644
--- a/cmds/backup/Android.mk
+++ b/cmds/backup/Android.mk
@@ -10,6 +10,6 @@
 LOCAL_MODULE:= btool
 
 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
-LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE_TAGS := optional
 
 include $(BUILD_EXECUTABLE)