title: Android ndk-build for Unity3d x86 and Arm.. Build for multiple architectures into one .so file
body: <p>I'm building a native C++ library for Android, for use with a Unity 3d project.<br>
  I want to build for arm and x86, so I set this in application.mk</p>
  
  <pre><code>APP_ABI := all
  </code></pre>
  
  <p>This gives me several seperate .so files. Unfortunately currently the way to include an native android library in a unity app is to add the library to the folder assets\Plugins\Android.
  I can only put one file with the libraries name in that folder. So i can only have one of the .so files in there. 
  Is there any way of merging them into one file?</p>