Null driver update

Updated the null video driver I hacked out yesterday. It now agrees to
any bitdepth that the application requests, so SDL won’t have to create a
shadow surface, and you can get an accurate idea of how much processing
time is being spent in your application.

Apply against CVS:

http://icculus.org/misc/SDL-1-2-null-video-RYAN-2.diff

–ryan. (@icculus1)

Updated the null video driver I hacked out yesterday. It now agrees to
any bitdepth that the application requests, so SDL won’t have to create a
shadow surface, and you can get an accurate idea of how much processing
time is being spent in your application.

Apply against CVS:

http://icculus.org/misc/SDL-1-2-null-video-RYAN-2.diff

Thanks Ryan!
I’ve added this to CVS. I renamed it “dummy” to match the other
dummy subsystem drivers.

See ya!
-Sam Lantinga, Lead Programmer, Loki Entertainment Software