rank_filter.recipe/meta.yaml: Allow the c++ compile and linking flags to be set.
rank_filter.recipe/meta.yaml: Allow the c++ compile and linking flags to be set.

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