R CMD check had option leakage from one package to the next when checking multiple packages.

git-svn-id: https://svn.r-project.org/R/trunk@62858 00db46b3-68df-0310-9c12-caf00c1e9a41
Add checks of foreign function call registration.
Add dontCheck function to suppress these tests, and potentially others.

git-svn-id: https://svn.r-project.org/R/trunk@62860 00db46b3-68df-0310-9c12-caf00c1e9a41