[Rd] Rtools42 and included libraries

[Winston Chang]

Rtools42 includes the pre-compiled libraries needed to build most CRAN
packages. From the blog (
https://developer.r-project.org/Blog/public/2021/12/07/upcoming-changes-in-r-4.2-on-windows/
):

> Most of the required package changes were due to downloading incompatible
pre-compiled libraries at installation time. Rtools42 includes libraries
for almost all CRAN packages, which can and should be used, instead.

Will these libraries be updated on a regular schedule? I'm wondering how to
manage library updates in the future.

-Winston

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