[build] Move unwinder to toplevel libgcc (v2)

[Rainer Orth]

"Joseph S. Myers" <joseph@codesourcery.com> writes:

> 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.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University