use autoreconf and autotools-dev to build on new architectures

The package sqlcipher fails to build from source on ppc64el, because
config.{guess,sub} are not updated during build.

Adding dh_autotools-dev to the build would solve that case. However, as
autoconf also being used, I thought it would also be convenient to replace
it by a full dh_autoreconf.

OBS: Using only dh_autoreconf produces no effect over config.{guess,sub},
since automake is not in use for the source pkg available.

The patch attached contains the modifications aforementioned, and are in
accordance with the following guide: https://wiki.debian.org/Autoreconf

patch from https://bugs.debian.org/755939

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