fix ill-guided linking of the DummyPlayer facade object type info

DummyPlayer is experimental code,
but actually we've established the convention
to linke the facade-proxies into common/interfaceproxy.cpp

src/proc/play/dummy-player-interface-proxy.hpp

@@ -46,6 +46,9 @@ namespace lumiera {
   /** storage for the DummyPlayer facade proxy factory... */
   lumiera::facade::Accessor<DummyPlayer> DummyPlayer::facade;
   
+  // emit the vtable here into this translation unit within liblumieracommon.so ...
+  DummyPlayer::~DummyPlayer()  { }
+  
   
   
   

src/proc/play/dummy-player-service.cpp

@@ -376,8 +376,5 @@ namespace lumiera { /* === Forwarding function(s) on the Process handle === */
     return proc::play::theDummyPlayerDescriptor();
   }
   
-  // emit the vtable here into this translation unit within liblumieraproc.so ...
-  DummyPlayer::~DummyPlayer()      { }
-  
   
 } // namespace lumiera