slightly streamline code

git-svn-id: https://svn.r-project.org/R/trunk@63235 00db46b3-68df-0310-9c12-caf00c1e9a41
more on portability

git-svn-id: https://svn.r-project.org/R/trunk@63236 00db46b3-68df-0310-9c12-caf00c1e9a41