Hide loud warning when using to third_party eigen

Summary:
This is a little excessive:
```
CMake Warning at cmake/Dependencies.cmake:201 (find_package):
  By not providing "FindEigen3.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Eigen3", but
  CMake did not find one.

  Could not find a package configuration file provided by "Eigen3" with any
  of the following names:

    Eigen3Config.cmake
    eigen3-config.cmake

  Add the installation prefix of "Eigen3" to CMAKE_PREFIX_PATH or set
  "Eigen3_DIR" to a directory containing one of the above files.  If "Eigen3"
  provides a separate development package or SDK, be sure it has been
  installed.
Call Stack (most recent call first):
  CMakeLists.txt:72 (include)
```
Closes https://github.com/caffe2/caffe2/pull/729

Differential Revision: D5183059

Pulled By: Yangqing

fbshipit-source-id: d17d5d06a50abb50f9978d022ddc4918e991079d
1 file changed
tree: 8153e40fb1eaaab617e4a640ebbb1b62cb871cde
  1. .travis/
  2. caffe/
  3. caffe2/
  4. cmake/
  5. docs/
  6. scripts/
  7. third_party/
  8. .Doxyfile
  9. .Doxyfile-c
  10. .Doxyfile-python
  11. .gitignore
  12. .gitmodules
  13. .travis.yml
  14. appveyor.yml
  15. CMakeLists.txt
  16. LICENSE
  17. Makefile
  18. PATENTS
  19. README.md
  20. release-notes.md
README.md

Caffe2

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