fix a build issue

build-ndk.sh

@@ -10,4 +10,5 @@ do
     mv libs/armeabi-v7a/$app src/main/assets/armeabi-v7a/
     mv libs/x86/$app src/main/assets/x86/
 done
+rm -rf src/main/jni
 mv libs src/main/jni

src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.shadowsocks"
-    android:versionCode="66"
-    android:versionName="2.1.5">
+    android:versionCode="67"
+    android:versionName="2.1.6">
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>