bug#26095: R: do not build recommended packages

[Ricardo Wurmus]

This relates to bug 25598 “R packages are not bit-reproducible”.  R
itself does not build reproducibly.  One of the reasons is that it
includes recommended packages that are built in a random temporary
directory.  The build paths for each of these packages is then embedded
in the packages’ “paths.rds” files.

We don’t have this problem when building the packages with the
“r-build-system” like any other R package.

This patch set adds package expressions for each of the recommended
packages, disables building of recommended packages, and adds some of
these packages to those R packages that need them.

I’ve successfully rebuilt all R packages to make sure that these changes
don’t break anything.

I also have an unpolished patch to fix bug 25598, but it depends on this
patch set.

--
Ricardo

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