[pkg] fix build of python3 debian package

debian/rules

@@ -22,11 +22,15 @@ ifeq (,$(build_py3k))
 endif
 
 install-python%:
-	python$* setup.py install --prefix=$(CURDIR)/debian/tmp
+	python$* setup.py install --root=$(CURDIR)/debian/tmp --prefix=/usr
 
 override_dh_auto_install: $(foreach python, $(shell py3versions -r), install-$(python))
 	dh_auto_install
 	rm -f debian/tmp/usr/lib/python*/*/logilab/__init__.py
 
+override_dh_auto_clean:
+	dh_auto_clean
+	rm -rf *.egg-info build
+
 %:
 	dh $@ --with python2,python3