cmake/modules/FindVIGRA.cmake: Export VIGRA_ROOT.
cmake/modules/FindVIGRA.cmake: Export VIGRA_ROOT.

jakirkham/rank_filter,DudLab/rank_filter,nanshe-org/rank_filter,nanshe-org/rank_filter,nanshe-org/rank_filter,DudLab/rank_filter,jakirkham/rank_filter,DudLab/rank_filter,jakirkham/rank_filter