[build] Move unwinder to toplevel libgcc (v2)

[Paolo Bonzini]

On 08/11/2011 05:26 PM, Rainer Orth wrote:
>
>> >  Actually I think the installation of all the installed target headers
>> >  should move to libgcc's Makefiles (and the headers themselves should move
>> >  under the libgcc/ directory).
> Agreed, added to my ever-growing todo list for the libgcc move.  This
> would be
>
> * gcc/ginclude, from gcc/Makefile.in (USER_H),
>
> * extra_headers from gcc/config.gcc, and
>
> * EXTRA_HEADERS from the gcc/config t-* files.

Writing that down in a wiki page (even as unformatted text)  would be 
useful.

Paolo