split soong_zip into a library and a binary

to make it faster/easier to invoke from other Go programs
(such as multiproduct_kati)

Bug: 67478260
Test: m -j
Change-Id: Idd2671a44290550197c88f53dd11a6dd39c85cc5

zip/cmd/Android.bp

@@ -0,0 +1,23 @@
+// Copyright 2016 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.
+
+blueprint_go_binary {
+    name: "soong_zip",
+    deps: [
+        "soong-zip",
+    ],
+    srcs: [
+        "main.go",
+    ],
+}