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 the Dreamcast joystick driver for SDL

noinst_LTLIBRARIES = libjoystick_dc.la
libjoystick_dc_la_SOURCES = $(SRCS)

# The SDL joystick driver sources
SRCS =  SDL_sysjoystick.c