[Patch] Fix libstdc++/11389

[Paolo Carlini]

Hi,

in a sense this is a regression: the fix for 9178 made difficult
to read long encoding() == 0 files containing only single byte
chars. The below restores the previous behaviour for that case,
while keeping the possibility to read any encoding() > 0 file.

Of course much more work is needed in the area but this little
step doesn't hurt...

Tested x86-linux, ok with everyone?

Paolo.

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