rectify build files.

Change-Id: I138ac7805cb045f960e32193bad95a73cd8b063e
diff --git a/tests/Android.mk b/tests/Android.mk
index 84e9559..e33169c 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -12,4 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-include $(call all-subdir-makefiles)
+LOCAL_PATH := $(call my-dir)
+include $(call all-makefiles-under,$(LOCAL_PATH))