Fix, do not consider directories with "." in their name for packages.
Fix, do not consider directories with "." in their name for packages.

* With this, e.g. the ".build" directory created by Nuitka itself
  was attempted to create a namespace package for with Python3
  which is not useful.

* For Python2 it is at least quicker to skip over what is surely
  not a package.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka