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().

# The cpuinfo library target
noinst_LTLIBRARIES = libcpuinfo.la

COMMON_SRCS = 			\
	SDL_cpuinfo.c

libcpuinfo_la_SOURCES = $(COMMON_SRCS)