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radianWrapper: Explicitly set R_HOME and always have R in buildInputs
Before this commit, `wrapR = false` (the default) would lead to
situations where the `RHOME` variable would not be found. Adding `--set
R_HOME ${R}/lib/R` so that the wrapper explicitly exports `R_HOME` fixes
this issue. In addition, R is also made part of `buildInputs` by default
so that package loading works correctly.