Calculator: update arity lib to v2.1.2 to fix log.

Bug 2464487.
diff --git a/Android.mk b/Android.mk
index 99e6f55..4008d8c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -31,7 +31,7 @@
 ##################################################
 include $(CLEAR_VARS)
 
-LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := libarity:arity-2.0.2.jar
+LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := libarity:arity-2.1.2.jar
 include $(BUILD_MULTI_PREBUILT)
 
 # Use the folloing include to make our test apk.