OpenMP + macOS round 20?

[coatless]

It seems like the CRAN r binary is now shipping with built-in libomp headers! So, the check inside of configure.ac and the inline plugin might need to be tweaked to unlock additional cores.

The goal of the ticket is to register a change in macOS; but, there is no need to exert energy since it's part of an ongoing discussion in R-SIG-MAC with Simon and Prof. Ripley chiming in.

[eddelbuettel]

Thanks for keeping tabs on it. I don't follow r-sig-mac but trust you will advice if/when/which changes are needed. Much appreciated.

[eddelbuettel]

@coatless Any update, or sage advice for something we should consider altering or adding?

[coatless]

Nope. We're going to close this out. Headers are still opt-in.