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-pbdzmq/package.py

@@ -37,6 +37,7 @@ class RPbdzmq(RPackage):
 
     homepage = "http://r-pbd.org/"
     url      = "https://cran.r-project.org/src/contrib/pbdZMQ_0.2-4.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/pbdZMQ"
 
     version('0.2-4', 'e5afb70199aa54d737ee7a0e26bde060')