rank_filter.recipe/build.sh: Drop externally set variables.
rank_filter.recipe/build.sh: Drop externally set variables.

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