add r-cpp11armadillo

[danielnachun]

Checklist

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[danielnachun]

We'll need this for conda-forge/r-lotri-feedstock#13, which is ultimately needed for conda-forge/r-rxode2-feedstock#12.

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/r-cpp11armadillo/meta.yaml) and found it was in an excellent condition.

[danielnachun]

@conda-forge/help-r This is now ready for review. Please disregard the Windows failure as this package is noarch: generic.

[danielnachun]

For some additional context, this package is noarch: generic because it only provides header files to Armadillo to be used by other packages and does do any compilation itself.

[mfansler]

Mostly good; just a couple minor adjusts suggested.

[mfansler]

Bit of a nit as it's noarch, but the win only seems to fail because this is not conditional:

Suggested change

	- $R -e "library('cpp11armadillo')"
	- $R -e "library('cpp11armadillo')" # [not win]
	- "\"%R%\" -e \"library('cpp11armadillo')\"" # [win]

[mfansler]

split urls:

Suggested change

	home: https://pacha.dev/cpp11armadillo/, https://github.com/pachadotdev/cpp11armadillo
	home: https://pacha.dev/cpp11armadillo/
	dev_url: https://github.com/pachadotdev/cpp11armadillo

[danielnachun]

I guess noarch: generic recipes can have selectors in the test block without failing linting! We should be all set here now.

[mfansler]

Thanks for adding!