allow no byte-compilation of recommended packages

git-svn-id: https://svn.r-project.org/R/trunk@63386 00db46b3-68df-0310-9c12-caf00c1e9a41
example added needs directional double quotes mapped

git-svn-id: https://svn.r-project.org/R/trunk@63388 00db46b3-68df-0310-9c12-caf00c1e9a41