Avoid build-time dependencies by prioritising binary over source dependencies for R #2277
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This fixes the windows build for this repo.
Fixes the failing R build as discussed in #2272 (comment) by never installing R packages from source. This may create problems if no binary is available for a platform, as the common CRAN mirrors only provide binaries for macOS, Windows and popular Linux distributions.
If that's a problem, my PR could be altered to try a source installations after a binary installation failed, with some additional complexity that can't be easily tested in the R code that is provided as string here. I am not sure what platforms are officially supported here.