Hard code output of Sweave on a 64-bit platform for the int64 section,
as there is no good way to conditionally influence the sweaving and we
still need to show 32-bit users what they are missing out on.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@770 edb9625f-4e0d-4859-8d74-9fd3b1da38cb