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!).

## Makefile.am for SDL using the DirectX video driver

noinst_LTLIBRARIES = libvideo_windx5.la
libvideo_windx5_la_SOURCES = $(DIRECTX_SRCS)

# The SDL DirectX video driver sources
DIRECTX_SRCS = 			\
	SDL_dx5events.c		\
	SDL_dx5events_c.h	\
	SDL_dx5video.c		\
	SDL_dx5video.h		\
	SDL_dx5yuv.c		\
	SDL_dx5yuv_c.h		\
	directx.h