Fix build breakage in dicttool

This CL fixes the build breakage caused by I0dd103185dcf62fb1e2505
due to the lack of android.text.Spanned in host environment.

BUG: 16029304
Change-Id: Ic966d10e8abe2c2be8d62c09d1502574535aa8b8

tools/dicttool/compat/android/text/Spanned.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.text;
+
+public interface Spanned extends CharSequence {
+}