Add RcppParallel linker flags for StanHeaders 2.26 Compatibility

[andrjohns]

This PR updates your package to additionally link against RcppParallel, which will be needed for the next version of StanHeaders

[mattfidler]

Thanks

[bgoodri]

Same deal as with nlmixr2est.

[mattfidler]

Same as rxode2parse

[mattfidler]

@bgoodri @andrjohns

Cran wanted cpp17 instead of cpp14. With the flags you supplied and cpp17 I have the following issue:

Dear maintainer,

Please see the problems shown on
https://cran.r-project.org/web/checks/check_results_rxode2ll.html.

Please correct before 2023-03-31 to safely retain your package on CRAN.

The CRAN Team

Does this need cpp14?

[mattfidler]

I can revert everything but I sm sure that doesn't help you.

[bgoodri]

Don't revert; we'll figure it out. Does nlmixr2 compile with the C++14 standard (but continuing to link to TBB)?

[andrjohns]

I believe you just need to replace -DBOOST_NO_AUTO_PTR with -D_HAS_AUTO_PTR_ETC=0 in your Makevars files

[mattfidler]

Thanks @andrjohns

I will try it out and resubmit to CRAN.

@bgoodri it linked without linking to the tbb threads library in the past, so I'm unsure. I use the backward AD engine only if that helps answer your question.

I separated out the stan pieces from nlmixr2est proper because armadillo and eigen were having problems. This should be fine.

[bgoodri]

With the current StanHeaders / rstan on CRAN, linking to TBB was somewhat optional and it would work either way if TBB was not utilized. With the next StanHeaders / rstan, linking to TBB is mandatory and there will be a linker error otherwise. So, the change to the linker flags is necessary for the next StanHeaders to have a smooth(er) path to CRAN.

The stuff about the C++ standard and -D_HAS_AUTO_PTR_ETC=0 is separate from TBB considerations and is mostly due to CRAN wanting everyone to use the C++17 standard for the next R release.