Improve ant build, eclipse runnable jar export, JogAmp ARM jars and GL2ES1 support

This pull request add the following features:
* Include jogamp native jars for linux-arm support
* ant build fix, dist now include jogamp, gdx-backend-jogl and gdx-joal jars.
* eclipse runnable jar export using gdx-backend-jogl
* Initial GL2ES1 support.

# libgdx runnable jar deployment using gdx-backend-jogl tutorial
1. From inside Eclipse and choose file > Export... > Java > Runable JAR File
2. Select the libgdx project in the drop-down menu
3. Change export destination and name the "main" jar
4. Library handling: select one of:
 * Package required libraries into generated JAR
 * Copy required libraries into a sub-folder next to the generated JAR
5. Click on Finnish

# Start the application using:
java -jar main.jar