Fix makefile for jni directory build.

Change-Id: I47bf6e955517ffdbd914ee3c1d87565d0cc3f3a4
diff --git a/Android.mk b/Android.mk
index 996453a..224a4be 100644
--- a/Android.mk
+++ b/Android.mk
@@ -17,4 +17,5 @@
 LOCAL_PROGUARD_ENABLED := disabled
 
 include $(BUILD_PACKAGE)
+
 include $(call all-makefiles-under,$(LOCAL_PATH))