Export ceres_cuda_kernels to project's build tree
This avoids the following CMake error when exporting Ceres build
directory to local CMake package registry:
export called with target "ceres" which requires target
"ceres_cuda_kernels" that is not in any export set.
Fixes #966
Change-Id: I5a75191fc414a3f138b19cb9d5850f7330f2d24a
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.