Give Derivation::tryResolve an evalStore argument

This is needed for building CA deriations with a src store / dest store
split. In particular it is needed for Hydra.

src/libstore/build/derivation-goal.cc

@@ -568,7 +568,7 @@ void DerivationGoal::inputsRealised()
                        inputDrvOutputs statefully, sometimes it gets out of sync with
                        the real source of truth (store). So we query the store
                        directly if there's a problem. */
-                    return worker.store.queryPartialDerivationOutputMap(drvPath);
+                    return worker.store.queryPartialDerivationOutputMap(drvPath, &worker.evalStore);
                 });
             assert(attempt);
             Derivation drvResolved { std::move(*attempt) };

src/libstore/derivations.cc

@@ -1002,10 +1002,10 @@ static void rewriteDerivation(Store & store, BasicDerivation & drv, const String
 
 }
 
-std::optional<BasicDerivation> Derivation::tryResolve(Store & store) const
+std::optional<BasicDerivation> Derivation::tryResolve(Store & store, Store * evalStore) const
 {
     return tryResolve(store, [&](const StorePath & drvPath) {
-        return store.queryPartialDerivationOutputMap(drvPath);
+        return store.queryPartialDerivationOutputMap(drvPath, evalStore);
     });
 }
 

src/libstore/derivations.hh

@@ -346,7 +346,7 @@ struct Derivation : BasicDerivation
      * 2. Input placeholders are replaced with realized input store
      *    paths.
      */
-    std::optional<BasicDerivation> tryResolve(Store & store) const;
+    std::optional<BasicDerivation> tryResolve(Store & store, Store * evalStore = nullptr) const;
 
     /**
      * Like the above, but instead of querying the Nix database for