[cvsnt] Prune fails on shared volume

[Per Lindberg]

cvs checkout -P foo fails to prune when you check out to a shared folder.
(Same problem regardless if the folder is on Samba or a Win2k box).

It has been mentioned on 
>tortoisecvs-users at lists.sourceforge.net
 that
cvsnt won't prune in certain circumstances because of some timing problem.
I dunno. In any case, I think it's important that cvsnt always prunes
consistently,
since directories can't be deleted in CVS, and pruning is the only kosher way
to live with that.

Best regards,
Per Lindberg