Extract jar-sorting to be accessible to soong_zip

Bug: 64536066
Test: m -j # which runs unit tests
Change-Id: I4830bd331c9dab0b1d300a18aefaf25a6af4cfdc

jar/Android.bp

@@ -0,0 +1,22 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// 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.
+
+bootstrap_go_package {
+    name: "soong-jar",
+    pkgPath: "android/soong/jar",
+    srcs: [
+        "jar.go",
+    ],
+}
+