Mark it as unistallable

So the build system can take it as a static Java library instead of a
shared Java library (.jar with classes.dex).

Change-Id: I5213b34dab8688c8e0dee49a17fadd7b9d29c9c2
diff --git a/Android.mk b/Android.mk
index d4859ec..6a5d2f0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -60,6 +60,6 @@
 LOCAL_MODULE := jetty-util
 LOCAL_SRC_FILES := lib/jetty-util-6.1.26.jar
 LOCAL_JACK_FLAGS := -D jack.import.jar.debug-info=false
+LOCAL_UNINSTALLABLE_MODULE := true
 
 include $(BUILD_PREBUILT)
-