[build] Move unwinder to toplevel libgcc

[Paolo Bonzini]

On 06/20/2011 02:24 PM, Rainer Orth wrote:
> * The only unwinder-related macro I haven't moved is
>    LIBGCC2_UNWIND_ATTRIBUTE.  It is only defined gcc/config/mips/mips.h.
>    I suppose we would need a libgcc equivalent of tm.h for that,
>    something I didn't want to attack at this point.

Something like the attached?

Paolo
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