CMakeLists.txt: Require C++11 support for building VIGRA bindings only.
CMakeLists.txt: Require C++11 support for building VIGRA bindings only.

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