[Alternate patch] libstdc++/9024

[Paolo Carlini]

Hi again,

reading the standard closer (27.8.1.4,10), "unbuffered" implies
that pbase() and pptr() always return null.

Therefore my first attempt seems not correct when the 'in'
openmode flag is true and _at the same time_ the 'out' openmode
flag is true too.

The below, tested x86-linux, fixes that problem.

Paolo.

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