Removed Eigen3 paths from initial_cache template
Removed Eigen3 paths from initial_cache template

The submodule is used by default, and EIGEN3_INCLUDE_DIR should only be set if a user has an explicit need for it.

patrikhuber/eos,icyrizard/eos,icyrizard/eos,patrikhuber/eos,patrikhuber/eos,icyrizard/eos