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

[Rainer Orth]

Paolo Bonzini <bonzini@gnu.org> writes:

> Trunk is frozen in fact, so please wait for the end of the freeze, too.

Sure.  I'll submit the libgomp patch soon and probably commit the whole
bunch (as separate check-ins) after everything is approved.

> (BTW, a better precedent for contrib/ is contrib/compare-debug.  So contrib
> is definitely a more than decent choice).

Ok, fine.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University