eliminate warnings from arlex.c

[Ben Elliston]

> %option is specific to flex.  I personally don't think the cost of a
> few warnings is enough to justify requiring flex here, particularly
> since we don't distribute flex with the binutils.  But that is just
> my opinion.

Don't binutils releases include the generated files?  Isn't it only
developers that require host tools like flex?

Ben
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