Pandora and OpenGLES renderer.The PANDORA define is used for Pandora spe...

This branch s compatible OpenPandora (ARM & GLES).

The PANDORA define is used for specific OpenPandora options (like screenres or keymapping)
The ARM define is used to avoid Bus Error on Arm (access of float not aligned on DWORD)
The HAVE_GLES define is used to change GL1 renderer in GLES renderer

Fixes Forsakenx/forsaken#255.