Fix creation of home: repos

Repos were missing reference to the home: 'System' repo

mpcdf_common.py

@@ -750,7 +750,9 @@ Macros:
         repo("System", (("software", distribution),))
 
     for compiler in compilers + pgis:
-        if project != "software":
+        if project.startswith("home:"):
+            dependencies = ((project, "System"),)
+        elif project != "software":
             dependencies = (("software", distribution),)
         else:
             dependencies = ()