Quartz driver OpenGL updates: Driver can now open whatever library is specified in SDL_GL_LoadLibrary() call (previously, it ignored this parameter), and uses the default system library when NULL is specified. Also, library is loaded once in SDL_GL_LoadLibrary() and not every call to SDL_GL_GetProcAddress().

## Makefile.am for SDL using the Win32 DIB video driver

noinst_LTLIBRARIES = libvideo_windib.la
libvideo_windib_la_SOURCES = $(WINDIB_SRCS)

# The SDL Win32 DIB video driver sources
WINDIB_SRCS = 			\
	SDL_dibevents.c		\
	SDL_dibevents_c.h	\
	SDL_dibvideo.c		\
	SDL_dibvideo.h		\
	SDL_vkeys.h