typo

git-svn-id: https://svn.r-project.org/R/trunk@66128 00db46b3-68df-0310-9c12-caf00c1e9a41
more use of headers

git-svn-id: https://svn.r-project.org/R/trunk@66130 00db46b3-68df-0310-9c12-caf00c1e9a41
Speed up native symbol resolution by avoiding install() and inherits() call.


git-svn-id: https://svn.r-project.org/R/trunk@66131 00db46b3-68df-0310-9c12-caf00c1e9a41