math/R-cran-RcppParallel: New port: Parallel programming tools for Rcpp

• Submitter becomes maintainer

High-level parallel programming primitives for the R language.
Includes the Intel TBB and RcppParallel libraries.

WWW: https://rcppcore.github.io/RcppParallel/

PR: 294584
Differential Revision: https://reviews.freebsd.org/D56355