You need to add a x86 folder in your libs directory (along the armeabi ones), and copy this file on it:
http://libgdx.badlogicgames.com/nightlies/dist/extensions/gdx-freetype/x86/
also, you are using the v0.9.6 files o.O use the nightlies:
http://libgdx.badlogicgames.com/nightlies/dist/extensions/gdx-freetype/