./configure and large file support

[Russ Allbery]

Russ Allbery <rra at stanford.edu> writes:

> Hm.  Maybe we have to use AC_FUNC_FSEEKO instead?  It also defines
> _LARGEFILE_SOURCE, which otherwise isn't necessary.

I'm committing something now that I think will fix this; give it a shot
and let me know if it works.

-- 
Russ Allbery (rra at stanford.edu)             <http://www.eyrie.org/~eagle/>

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