bootstrap gcc for powerpc

[Roland McGrath]

I have not tried the approach of running libc's make install-headers before
building GCC.  You surely need to do "make install-headers no_deps=t";
I'm not confident that will really work either, but it's worth a try.

What I have done is to build GCC first with no headers installed (using
--enable-languages=c), use make -k and ignore errors building libgcc,
install gcc.  Then build libc and install it (libs and headers, programs
won't link).  Then go back and do a complete GCC build and install.  Then
go back and finish building libc.

It would be good to get a coherent procedure for building a gcc+libc cross
environment from scratch specified somewhere and make sure it works.

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