Fix test in case fallocate(1) is available, but fails

That happens on Travis s390x for whatever reasons. Thus, instead of
checking for `fallocate -h`, we attempt the real allocation and

Fix test in case fallocate(1) is available, but fails

That happens on Travis s390x for whatever reasons. Thus, instead of
checking for `fallocate -h`, we attempt the real allocation and skip if
that fails.

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Fix #81145: copy() and stream_copy_to_stream() fail for +4GB files

When mapping the file, we need to pass the proper `dwFileOffsetHigh`
instead of `0`.

Co-authored-by: Nikita Po

Fix #81145: copy() and stream_copy_to_stream() fail for +4GB files

When mapping the file, we need to pass the proper `dwFileOffsetHigh`
instead of `0`.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Closes GH-7158.

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