dist/replica: add /mips64, /spim and /spim64 directories to plan9.proto

dist/replica/plan9.proto

@@ -37,12 +37,18 @@ arm	- sys sys
 	+	- sys sys
 mips	- sys sys
 	+	- sys sys
+mips64	- sys sys
+	+	- sys sys
 power	- sys sys
 	+	- sys sys
 power64	- sys sys
 	+	- sys sys
 sparc	- sys sys
 	+	- sys sys
+spim	- sys sys
+	+	- sys sys
+spim64	- sys sys
+	+	- sys sys
 
 # everything else is owned by sys
 acme	- sys sys