Remove the need to find Android.mk files via directory symlinks

Bug: 64397960
Test: m -j
Change-Id: I5b77dd654dfced63900913c447b5448b632158d7

target/Android.mk

@@ -0,0 +1,23 @@
+#
+# Copyright (C) 2017 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.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+# Only if this Android.mk was included not by a symlink should it be used.
+# This facilitates the transition away from symlinks: b/64397960
+ifeq ($(LOCAL_PATH),build/make/target)
+include $(call first-makefiles-under,$(LOCAL_PATH))
+endif

tools/Android.mk

@@ -16,4 +16,8 @@
 
 LOCAL_PATH := $(call my-dir)
 
+# Only if this Android.mk was included not by a symlink should it be used.
+# This facilitates the transition away from symlinks: b/64397960
+ifeq ($(LOCAL_PATH),build/make/tools)
 include $(call all-makefiles-under,$(LOCAL_PATH))
+endif