Fix PDK build.

Change-Id: I44df79e2e88a90818c2145e6b1682a1f90cfb346
diff --git a/java/tests/Android.mk b/java/tests/Android.mk
index 5053e7d..9b55c42 100644
--- a/java/tests/Android.mk
+++ b/java/tests/Android.mk
@@ -1 +1,3 @@
+ifneq (true,$(TARGET_BUILD_PDK))
 include $(call all-subdir-makefiles)
+endif