Bug#883619: libceres-dev: dependency on libeigen3-dev isn't strong enough

[Dima Kogan]

Package: libceres-dev
Version: 1.13.0+dfsg0-1
Severity: normal

Hi. Currently in libceres-dev we have

  Depends: libeigen3-dev (>= 3.2.1)

However in /usr/lib/cmake/Ceres/CeresConfig.cmake it does

  set(CERES_EIGEN_VERSION 3.3.4)

And then proceeds to barf if this wasn't found. The Depends should be
tightened accordingly, or the requirement in the .cmake file should be
loosened, if it CAN work with < 3.3.4.

Thanks