Fixed mkdir in clean

Makefile

@@ -19,7 +19,7 @@ all: subdirs
 
 clean:
  rm -f *.pyc *.pyo *~ *.bak
- rm -f $(BUILDDIR)/{SOURCES,SRPMS,RPMS}/*
+ rm -f $(BUILDDIR)/SOURCES/* $(BUILDDIR)/SRPMS/* $(BUILDDIR)/RPMS}/*
  mock -r $(MOCK_CONF) --clean
  for d in $(SUBDIRS); do make -C $$d clean ; done
  cd test; rm -f *.pyc *.pyo *~ *.bak