make distclean does not delete everything?

[Christoph]

I ran make distclean on an Emacs git checkout on Xubuntu 9.10 and 
expected to see a clean checkout directory with all build files removed.

However, git status showed there were a couple of files left, which were 
not in version control:

etc/emacs.pyc
etc/emacs2.pyc

and

lisp/MANIFEST

These files were generated on one of my previous builds. Shouldn't they 
also be removed by distclean? extraclean also does not seem to remove 
these. Bug?

Christoph