The arguments have changed in these functions, and don't seem to be backwards compatible. Please make the arguments exactly backwards compatible. I understand that some of the arguments are no longer relevant, but just ignore them - so that old code works. Also, it looks like you have new function mglMetalArcs. Perhaps you could put a comment in each of the Glu functions to say that people writing new code should use mglMetalArcs instead.
The arguments have changed in these functions, and don't seem to be backwards compatible. Please make the arguments exactly backwards compatible. I understand that some of the arguments are no longer relevant, but just ignore them - so that old code works. Also, it looks like you have new function mglMetalArcs. Perhaps you could put a comment in each of the Glu functions to say that people writing new code should use mglMetalArcs instead.