[Patch] Fix libstdc++/10975

[Paolo Carlini]

Hi,

the below fixes the PR implementing the resolution of DR 453: it looks like
we agree (at least Benjamin (privately), Nathan (see audit trail) and 
myself)
that this is a real defect, with a trivial fix. In the meanwhile, the DR 
also
includes the proposed wording. If someone objects, however, we can well 
delay
the issue, no problem with me.

During the work, a small surprise: the original testcase for 2346-sstream
was largely broken (seekg/teelg in *write* mode).

Tested x86-linux, will wait until this evening in case of comments.

Paolo.

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