Bug#727630: Use dh_autotools-dev to update config.{sub, guess} for new ports

[Sebastiaan Couwenberg]

Hi Matthias,

The current 4.1.1-5 version of spatialite cannot be built on arm64
because of unmet build dependencies.

It seems the debhelper, perl and file builds for arm64 have some
circular build dependencies.

I'll keep an eye on buildd logs, because I'd still like to know if the
dh-autoreconf change is sufficient to support arm64.

Kind Regards,

Bas

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