Adapt joy-test.c for Atari 5200 (only has 20x24 display)
Fix static driver name.
set DYN_DRV to 0; define atr5200std_joy
use DYN_DRV and MOUSE_DRIVER defines to decide which driver to use
fix last change
Merge pull request #125 from groessler/something_to_pull2

Adapt joy-test.c for Atari 5200