Re-add list_url for all R packages (#6110)

* r-igraph: find old packages in the archive

Fixes #6104.

* r-irlba: find old packages in the archive

Fixes #6101.

* r-lazyeval: find old packages in the archive

Fixes #6102.

* packages: set list_url for all packages hosted on CRAN

* packages: consistently use the CRAN archive URLs

var/spack/repos/builtin/packages/r-ape/package.py

@@ -44,6 +44,7 @@ class RApe(RPackage):
 
     homepage = "http://ape-package.ird.fr/"
     url      = "https://cran.r-project.org/src/contrib/ape_4.1.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/ape"
 
     version('4.1', 'a9ed416d6d172d4b9682556cf692d7c2')