Summary:
This introduces a few things:
- It enables us to create Caffe2Config.cmake that can be used down the road for building dependent libraries, so they do not need to explicitly write FindCaffe2.cmake.
- The config file will automatically figure out transitive dependency of Caffe2 as well as compiler flags.
- This diff also disables the RPATH setting since it is kind of a mess right now. In principle, we should figure out a clearer rpath setting following the typical rpath setting choices (https://cmake.org/Wiki/CMake_RPATH_handling) - I can send a follow up PR to clean this up.
- Minor: removed old gflags ang glog files.
Closes https://github.com/caffe2/caffe2/pull/1354
Reviewed By: dzhulgakov
Differential Revision: D6098014
Pulled By: Yangqing
fbshipit-source-id: cb06c41a7ef60fddb78b24887b6b3e82684b7c6b
