Bug#835037: ceres-solver: FTBFS with eigen3 >> 3.3~beta1

[Philipp Huebner]

Source: ceres-solver
Version: 1.11.0~dfsg0-5
Severity: serious
Tags: upstream
Justification: Policy 2.1

As found out through reproducible builds, ceres-solver FTBFS since
eigen3 3.3~beta2 was uploaded:
https://tests.reproducible-builds.org/debian/rbuild/unstable/amd64/ceres-solver_1.11.0~dfsg0-5.rbuild.log

Building with eigen3 3.3~beta1 works without problems.