disable ppc64 multilib on powerpc-darwin8 for 4.0?

[Mike Stump]

On Friday, March 25, 2005, at 03:39  PM, Geoffrey Keating wrote:
> At present, the 4.0 branch doesn't bootstrap on powerpc-darwin8,
> because libffi & libjava haven't been ported to ppc64 yet.

The most recent error message I get from the libjava build is...

symbolIndex(atom #142693)
from .libs/libgcj.la-1.o
ld64 failed: atom not found

which make it sound rather nasty.  I don't know if this is an ld64 bug, 
a codegen issue, or can be worked around with libtool fun.

> Mike has done some work on the port, but it's not done yet, and even
> if it was I don't know that it should go on the 4.0 branch before the
> 4.0.0 release.

If I can get it working on mainline, and those changes are safe for 
4.0.0, I'll seek to move them there...

> So, in the meantime, I propose this patch for the 4.0 branch.

I propose that we do this for mainline, and backport it to 4.0, as it 
is a regression on mainline as well as 4.0.

I endorse the proposed change.