Add dependency type tp r- packages

This PR adds the `nolink` dependency type to r- package dependencies.
This is needed due to the new dependency types in Spack. A couple of
packages were updated with new versions as well.

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

@@ -44,7 +44,7 @@ class RRpostgresql(Package):
 
     extends('R')
 
-    depends_on('r-dbi')
+    depends_on('r-dbi', type=nolink)
     depends_on('postgresql')
 
     def install(self, spec, prefix):