I've successfully built the latest github code for libgdx's native libraries (and its dependency gl2-android) for Android on x86. I've tested it with the invaders sample project on an Android 4.1 emulator without trouble, but I make no guarantees about any fit-for-release status. I'm using it to test an Android project on my local machine where running an arm emulator is painfully slow, but an x86 emulator with Intel's HAXM native library is acceptable, but my final target is still arm-only.
To use: drop the x86 folder with its two .so files into the libs directory of your -android libgdx project, alongside the 'armeabi' and 'armeabi-v7' directories. Then run on an x86 emulator.
Ideally LibGDX shouldn't depend on
http://code.google.com/p/gl2-android for Android on x86 since Android x86 only supports versions of Android with a fully functional OpenGL 2.0 implementation, but that would require a significant refactoring of LibGDX's Java code, so this is a simple solution that works for development at least.