Added missing function implementations.

[[Imported from SVN: r501]]

istl/paamg/pinfo.hh

@@ -119,9 +119,9 @@ namespace Dune
 
       typedef int GlobalLookupIndexSet;
 
-      void buildGlobalLookup(std::size_t);
+      void buildGlobalLookup(std::size_t){};
 
-      void freeGlobalLookup();
+      void freeGlobalLookup(){};
 
       const GlobalLookupIndexSet& globalLookup() const
       {