Address Eigen warnings - Update itkeigen library

[blowekamp]

There are warning on cdash like the following:

Modules/ThirdParty/Eigen3/src/itkeigen/../itkeigen/Eigen/src/Core/GenericPacketMath.h:655:61: warning: declaration shadows a local variable [-Wshadow-uncaptured-local]
return pminmax_impl<NaNPropagation, IsInteger>::run(a, b, EIGEN_BINARY_OP_NAN_PROPAGATION(Packet, (pmin)));

https://open.cdash.org/viewBuildError.php?type=1&buildid=10616735

Proposed PR #5482, suppressed these warnings, but @seanm commented that the fix is already in the library upstream.

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[seanm]

@phcerdan you seem adept at the git magic to update eigen, think you could do it again? :)

[phcerdan]

@seanm I am glad to do it, but I think is even better if we do it together. What do you think about a pair-programming session, so you get a grasp on how to do it yourself? :)

[pzaffino]

Hi,
is there any chance to use Eigen5?

Thanks,
Paolo