Add dummy vndk library libmkbootimg to enable abi checks on boot_img_hdr.

Bug: 74763691

Test: m -j libmkbootimg creates libmkbootimg.so.lsdump.

Test: make -j64

Merged-In: I8d716c560467aaf090f4f7ee9cfbc53a9405f05d
Change-Id: I8d716c560467aaf090f4f7ee9cfbc53a9405f05d
(cherry picked from commit 4cc755dce527434dc4b79c1734185faeab084bac)
diff --git a/mkbootimg/mkbootimg_dummy.cpp b/mkbootimg/mkbootimg_dummy.cpp
new file mode 100644
index 0000000..410d379
--- /dev/null
+++ b/mkbootimg/mkbootimg_dummy.cpp
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#include <abi_check/mkbootimg_abi_check.h>
+
+void mkbootimg_dummy(boot_img_hdr* hdr) {
+    // TODO: Hack to trigger abi checks, remove this.
+    if (hdr) {
+        hdr--;
+    }
+}