[patch] ppc64 native target for gcc

[Jack Howarth]

Mike,
    It seems that the following is going to work...

setenv gcc "gcc -m64"
setenv ld ld64

../gcc/configure --prefix=/Users/howarth/work/gcc42 --enable-languages=c,c++ --host=powerpc64-apple-darwin8 --target=powerpc64-apple-darwin8 --disable-multilib
make

Eric really should fix this up to make the bootstrap of the powerpc64-*-darwin*
explicitly use -m64 and ld64 since there likely will never be an stock
Apple compiler that defaults to -m64 on PPC. I would assume the same issue
applies to the x86_64-*-darwin* target he created.
               Jack