-Winline is not portable either

git-svn-id: https://svn.r-project.org/R/trunk@63393 00db46b3-68df-0310-9c12-caf00c1e9a41
add xref

git-svn-id: https://svn.r-project.org/R/trunk@63395 00db46b3-68df-0310-9c12-caf00c1e9a41
wider search for non-portable flags

git-svn-id: https://svn.r-project.org/R/trunk@63397 00db46b3-68df-0310-9c12-caf00c1e9a41
add comment

git-svn-id: https://svn.r-project.org/R/trunk@63398 00db46b3-68df-0310-9c12-caf00c1e9a41