[Patch] Fix libstdc++/7744

[Paolo Carlini]

Hi,

this is the fix which we have already discussed at length:
when not synced with stdio, we use read/write/lseek.

Tested x86-linux.

Nathan, I see that going through the code many chances of
more fundamental possibilities of improvement appear to your
eyes (in particular from the performance point of view) on the
other hand our forces are limited, and we still have a good
amount of bugs to fix :(

I hope to return to the former after 9533-9423-9024-9875-9178
and 9964-9988.

Nathan, Benjamin, ok?

Thanks,
Paolo.

P.S. Benjamin, in my private message I forgot _your_ 9780!

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