Update three more uses of attribute getting for R 4.6.0 or later #1450
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Closes #1432
Just before we came out with Rcpp 1.1.1 in January (entirely on schedule), R Core / Luke / CRAN rushed out another interim fix (we were not involved) building on the preceding one from December (which was needed as they had borked builds on R-devel). This interim version switched to three more 'then new' accessors around attributes, and did so in a non-versioned way (hence breaking builds on R-release or older).
Anyway, the three small changes are fine for R-devel so this PR brings them over, but this time properly conditioned. Builds and checks on r-devel, and remains unchanged for all other versions so no hickups expected.
Checklist
R CMD checkstill passes all tests