* Pass various options to the worker so that flags like -K or -j work

in multi-user Nix (NIX-72).
* Client/worker: exchange a protocol version number for future
  compatibility.

src/libstore/remote-store.hh

@@ -77,6 +77,8 @@ private:
     void forkSlave();
     
     void connectToDaemon();
+
+    void setOptions();
 };