[build, doc, v3] Support Sun symbol versioning in libstdc++-v3, rev. 2

[Rainer Orth]

Paolo Bonzini <bonzini@gnu.org> writes:

>>        contrib:
>>        * make_sunver.pl: New file.
>
> Not sure this belongs in contrib.  Probably the toplevel or, for now,
> libstdc++-v3, is a better place.

I don't like to clutter toplevel with random helper scripts.  It seems
to fall into the same class as contrib/test_summary, which is used by
make mail-report.log.

Since the same script will be used by all other (already approved or to
be resubmitted) Sun versioning patches, libstdc++-v3 isn't appropriate.

Thanks.
	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University