[Patch draft] Fix libstdc++/8610

[Paolo Carlini]

Hi!

So, here comes my first draft. Everything seems to work :), but I
encourage your feedback for refining it. For instance, perhaps I'm
being naive in checking if a value passed to 'lseek' doesn't
overflow off_t like this:

    if (__off != static_cast<off_t>(__off))

???
It works, but probably we can do better...

Also, is it safe to assume that a libc making available lseek64
does also provide fopen64?

IMPORTANT: don't do my same error: if you want to try the patch on
the attached testcase or whatelse of your like, remember to set
appropriate 'ulimit -f' in the shell! For instance, my bash 2.0.5b
has only 1 Gigabyte, by default!

Paolo.

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