Move ELF build-id reader into a separate library.

Bug: 328702178
Change-Id: I188a8d20d22e67e4f0c7e3441e3781fff369c828

elf/Android.bp

@@ -0,0 +1,28 @@
+// 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.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+bootstrap_go_package {
+    name: "soong-elf",
+    pkgPath: "android/soong/elf",
+    srcs: [
+        "elf.go",
+    ],
+    testSrcs: [
+        "elf_test.go",
+    ],
+}