addendum to last commit: forgot files outside the /Externals/GLew directory…
update GLEW on windows to 1.5.6 (and any platform that builds from source)
remove glx stuff that we weren’t using
Update Cg for windows to 3.0.0007
Update the Cg framework for OS X to version 3.0.17.
Tested with ATI 2600 and NVidia 9400 graphics.
I have not updated the header files. There doesn’t appear to be any
obvious interface changes for OS X, but the same might not be true