[tree-ssa] Fix libbanshee warning

[Joseph S. Myers]

On Sun, 29 Feb 2004, Daniel Berlin wrote:

> On Feb 29, 2004, at 4:01 AM, Andreas Jaeger wrote:
> 
> >
> > Are we going to merge libbanshee into mainline with the rest of
> > tree-ssa?  In that case we should enable some more warnings...
> 
> Why?
> It's an external library.

Then as an external library it needs a note at the top of README like
those in fastjar/README, libffi/README and zlib/README.  In any case,
being built into the compiler it presumably needs to compile with non-GCC
C90 compilers, hence the warnings.

-- 
Joseph S. Myers
jsm@polyomino.org.uk