rviz: added cmake/FindEigen.cmake to match previously-committed CMakeLists.txt changes.
rviz: added cmake/FindEigen.cmake to match previously-committed CMakeLists.txt changes.

git-svn-id: 0026580bb7e4cc6a4dfc3b6e5daae18624e1a30c@38368 eb33c2ac-9c88-4c90-87e0-44a10359b0c3

ros-visualization/rviz,ros-visualization/rviz,ros-visualization/rviz,ros-visualization/rviz,ros-visualization/rviz