Prefer createrepo_c over createrepo

yum/clean_repos.sh

@@ -1,8 +1,9 @@
+createrepo="$(which createrepo_c createrepo | head -n 1)"
 for repo in dom0-updates installer qubes-dom0 ; do
     echo "---> Cleaning up repo: $repo..."
     rm -f $repo/rpm/*.rpm
     rm -f $repo/repodata/*
-    createrepo -q $repo
+    $createrepo -q $repo
 done