a few fixes


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@742 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
another one


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@743 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update the windows library

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@744 edb9625f-4e0d-4859-8d74-9fd3b1da38cb