Bug#952801: libeigen3-dev headers have deprecated-copy warnings on GCC 9

[Mike Purvis]

Package: libeigen3-dev
Version: 3.3.7-1
X-Debbugs-CC: ginggs at debian.org

I'm seeing this problem when attempting to build my company's ROS-based
robotics software on the not-yet-released Ubuntu Focal.

Upstream had patched this issue on their master branch (targeting Eigen
3.4), and was gracious enough to cherry-pick the changes over to their 3.3
support branch, see:

https://gitlab.com/libeigen/eigen/-/merge_requests/29
https://gitlab.com/libeigen/eigen/-/commits/3.3

Thanks very much to Christoph Hertzberg for the quick turnaround on that.

I have in turn imported these patches as-is to the current 3.3.7-1 package
and released it to PPA here:

https://launchpad.net/~mikepurvis/+archive/ubuntu/eigen/

I have installed that version into my environment and confirmed that it
corrects the issues with my build. I proposed that the Ubuntu maintainer
take the patches, but they suggested sending them upstream to Debian:

https://bugs.launchpad.net/ubuntu/+source/eigen3/+bug/1865225

Am hopeful that this can be fixed ahead of the Focal release so that we
don't have to silence that new warning in all of the build configs where we
use -Werror!

I am using Ubuntu Focal 20.04 in a chroot with kernel 4.15.0-72-generic,
and libc 5.4.0-14.17.
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