SDL_GetAppState() correction when toggling fullscreen on OSX. Patch by me to address this comment on the SDL mailing list: "There appears to be a serious bug with SDL_GetAppState on OS X (10.3.9). When first running in windowed mode and then switching to full screen mode by calling SDL_SetVideoMode, SDL_GetAppState returns 4 (SDL_APPACTIVE) instead of 7 (SDL_APPMOUSEFOCUS | SDL_APPINPUTFOCUS | SDL_APPACTIVE). However, the SDL application clearly does have the keyboard focus, since it is able to receive keyboard events." --ryan.

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

noinst_LTLIBRARIES = libvideo_null.la
libvideo_null_la_SOURCES = $(NULL_SRCS)

# The SDL null video driver sources
NULL_SRCS = 			\
	SDL_nullvideo.h		\
	SDL_nullevents.c	\
	SDL_nullevents_c.h	\
	SDL_nullmouse.c		\
	SDL_nullmouse_c.h	\
	SDL_nullvideo.c