Add host dependencies for r-rcpparmadillo
Add host dependencies for r-rcpparmadillo

Followed the example from the recipe for RcppEnsmallen
https://github.com/conda-forge/staged-recipes/pull/13012
https://conda-forge.org/docs/maintainer/knowledge_base.html#openmp

ocefpaf/staged-recipes,johanneskoester/staged-recipes,ocefpaf/staged-recipes,conda-forge/staged-recipes,conda-forge/staged-recipes,johanneskoester/staged-recipes