Remove %clean section

None of currently supported distributions need that.
Last one was EL5 which is EOL for a while.

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

po-debconf.spec

@@ -94,9 +94,6 @@ cp -a podebconf-report-po_templates/ %{buildroot}/%{_datadir}/%{name}/templates
 
 %find_lang po-debconf --without-mo --with-man --all-name
 
-%clean
-rm -rf %{buildroot}
-
 %files -f po-debconf.lang
 %defattr(-,root,root,-)
 %doc COPYING README README-trans