Seperate glX from HAVE_OPENGL, for platforms that have both an X server and a more official way to do OpenGL, explicitly check for glX on Mac OS X, and use SDL_LoadObject for platforms that have glX but don't have dlopen().

## Makefile.am for SDL audio "driver" that writes to a file.

noinst_LTLIBRARIES = libaudio_disk.la
libaudio_disk_la_SOURCES = $(SRCS)

# The SDL audio driver sources
SRCS =	SDL_diskaudio.c	\
	SDL_diskaudio.h