bug#26095: R: do not build recommended packages

[Ricardo Wurmus]

>> What do you think about having an "r" and
>> "r-without-recommended-packages" instead of
>> "r-with-recommended-packages" and "r", respectively?

[…]

> Alternatively, we could change the r-build-system to use “r-minimal” by
> default, rename “r” to “r-minimal” (both variable and package name), and
> then rename “r-with-recommended-packages” to just “r” (both variable and
> package name).

I went ahead and implemented this in a follow-up commit.  (Doing this
all at once turned out to be a little too cluttered.)  I’ve pushed this
to master with commit 2d7c4ae3ee83841ef827a160b0d23c1d10d2570d.

Thanks for the review and the discussion!

-- 
Ricardo

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