I have the same problem and just tried building the package myself. Although the libnss-libraries are built, they are not included in the winbind-package.
I would therefore assume that the libraries are missing from one of the numerous files in the debian directory. Unfortunately I don't know which one :-) Anyone else? -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org