[build] Move unwinder to toplevel libgcc

[Rainer Orth]

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

> I interpreted Rainer's comment as meaning that a 
> libgcc/config/mips/mips-lib.h (or similar) file would need to be created 
> and inserted in the right place in libgcc_tm_file for the large number of 
> targets presently putting mips.h in tm_file.

Indeed, that's why I refrained from attacking this by other means.

	Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University