nix build: Use Nix search path

That is, unless --file is specified, the Nix search path is
synthesized into an attribute set. Thus you can say

  $ nix build nixpkgs.hello

assuming $NIX_PATH contains an entry of the form "nixpkgs=...". This
is more verbose than

  $ nix build hello

but is less ambiguous.

src/nix/installables.hh

@@ -21,10 +21,13 @@ struct UserEnvElem
 
 typedef std::vector<UserEnvElem> UserEnvElems;
 
+struct Value;
+class EvalState;
+
 struct MixInstallables : virtual Args
 {
     Strings installables;
-    Path file = "<nixpkgs>";
+    Path file;
 
     MixInstallables()
     {
@@ -33,6 +36,13 @@ struct MixInstallables : virtual Args
     }
 
     UserEnvElems evalInstallables(ref<Store> store);
+
+    /* Return a value representing the Nix expression from which we
+       are installing. This is either the file specified by ‘--file’,
+       or an attribute set constructed from $NIX_PATH, e.g. ‘{ nixpkgs
+       = import ...; bla = import ...; }’. */
+    Value * buildSourceExpr(EvalState & state);
+
 };
 
 }