[build] Move unwinder to toplevel libgcc (v2)

[Rainer Orth]

Paolo Bonzini <bonzini@gnu.org> writes:

>> How should we proceed with this patch, especially given the quite
>> moderate comments from most affected target maintainers?
>
> ARM is the only target we should care a bit about.  Any chance you can try
> cross-compiling it (with a combined tree it should not be hard)? Just to
> see that it builds.

I've tried to setup crosstool-NG in the past, but failed and haven't
gotten around to debugging this yet.  I still mean to, especially given
that I need to investigate testsuite issues in a cross environment.

Nick already ok'ed the arm (and frv) parts, so we should be ok for now.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University