Ports x11/gnustep/ failures on macppc

Greetings all,
I've spent some time looking into getting the GNUstep packages working
under clang on macppc, and it seems that the root cause of the failure
is va_arg simply not working correctly when passed type 'id'. The
workaround to get all of the GNUstep packages compiling correctly
right now is replacing any occurance of va_arg(_, id) with va_arg(_,
void*). Having done this, I've got a fully working set of gnustep
packages which I've been using for a few weeks without issue now.

I've got a patch that does this for base and a few other packages if
anyone is interested.
I've also filed a bug report here:
https://bugs.llvm.org/show_bug.cgi?id=47921

Anyways, this is just an 'FYI' in case anyone cares!

Thanks,
Anthony.