Drop SRC
Drop SRC

As we already have this set from `conda-build`, there is no need for us
to figure this one out on our own.

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