PR#496 Makefile/spec fixes for building on el6

Merges #496
https://pagure.io/koji/pull-request/496
Fixes #494
https://pagure.io/koji/issue/494

Makefile

@@ -59,7 +59,7 @@ clean:
 	rm -f *.o *.so *.pyc *~ koji*.bz2 koji*.src.rpm
 	rm -rf koji-$(VERSION)
 	for d in $(SUBDIRS); do make -s -C $$d clean; done
-	coverage erase
+	coverage erase ||:
 
 git-clean:
 	@git clean -d -q -x

koji.spec

@@ -62,7 +62,7 @@ contains shared libraries and the command-line interface.
 %package -n python2-%{name}
 Summary: Build system tools python library
 %{?python_provide:%python_provide python2-%{name}}
-BuildRequires: python2-devel
+BuildRequires: python-devel
 Requires: python-krbV >= 1.0.13
 Requires: rpm-python
 Requires: pyOpenSSL