Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe if SDL is built with a non-cdecl calling convention, and it's just generally bad practice anyhow. Now programs explicitly call SDL_Quit() where appropriate, wrap SDL_Quit() in a cdecl function where it can't be avoided, and rely on the parachute where a crash might have hit the atexit() before (these ARE test programs, after all!).

#include "SDL_nxvideo.h"

extern WMcursor * NX_CreateWMCursor (_THIS, Uint8 * data, Uint8 * mask, int w, int h, int hot_x, int hot_y) ;
void NX_FreeWMCursor (_THIS, WMcursor * cursor) ;
extern void NX_WarpWMCursor (_THIS, Uint16 x, Uint16 y) ;
extern int NX_ShowWMCursor (_THIS, WMcursor * cursor) ;