[patch] libstdc++/56193 re-add basic_ios::operator bool()

[Jonathan Wakely]

On 24/09/14 23:18 +0100, Jonathan Wakely wrote:
>This changes operator void*() to operator bool(), and ensures we
>export both from the library.
>
>I have a new test for this, but will commit that tomorrow.

Here are the tests.

Tested x86_64-linux, committed to trunk.

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