[armyops] joystick segs

[Ryan C. Gordon]

> Setting UseJoystick to True in the SDLDrv.SDLClient section
> results in a segmentation fault, when a joystick is available:

This was a mismerge bug when wedging UT2003's SDLDrv into ArmyOps. The
SDLDrv replacement I posted here to hopefully fix 16-bit color issues
happens to also have this crash fixed:

  https://bugzilla.icculus.org/show_bug.cgi?id=483

That being said, I don't know if this game actually supports a joystick,
even on win32, but at least the crash is fixed.

--ryan.