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 libVGL video driver

noinst_LTLIBRARIES = libvideo_vgl.la
libvideo_vgl_la_SOURCES = $(VGL_SRCS)

# The SDL libVGL video driver sources
VGL_SRCS = 			\
	SDL_vglvideo.h		\
	SDL_vglevents.c		\
	SDL_vglevents_c.h	\
	SDL_vglmouse.c		\
	SDL_vglmouse_c.h	\
	SDL_vglvideo.c