Fix missing include in Android.mk.

Change-Id: Iba4e77e084b03a69d8e89803099c3804a7926f0b
diff --git a/Android.mk b/Android.mk
index 0f717f1..bef48c0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -311,3 +311,4 @@
 include $(LLVM_ROOT_PATH)/llvm-host-build.mk
 include $(BUILD_HOST_STATIC_LIBRARY)
 
+include $(call all-makefiles-under,$(LOCAL_PATH))