[Patch] Fix libstdc++/10097

[Benjamin Kosnik]

>Indeed. 27_io its bigger and a little bit more tricky somewhere.

Indeed. I thought I'd offer to take the one I judged to be more work.
Also, I'd like to fix it so that the interactive tests are actually run
by default (among other warts...)

>Anyway, I'm already half way through my 21, I hope to send you the 
>tarball before the end of the day...

Ha ha! Cool. Are you adding wstring tests as well? Really cool.

-benjamin