make some unit tests non-windows
make some unit tests non-windows

- how to reliably create a read-only Windows directory?


git-svn-id: b54cb9a21d567fd88861a49b900e1162c163fec7@120661 bc3139a8-67e5-0310-9ffc-ced21a209358

Bioconductor/Bioconductor