* dh_installdocs/examples: Don't unnecessarily use the exclude code path.

* dh_installdocs/examples: Don't unnecessarily use the exclude code path.
* Avoid infiinite recursion when told to install a directory ending with
  "/." (slashdot effect?). Indeed, arbitrarily complex paths can be used
  now, although there's really no point in using them. Closes: #253234