steamPackages.steam-runtime-wrapped: fix w. multiple outputs

pkgs/games/steam/runtime-wrapped.nix

@@ -82,6 +82,7 @@ let
   ] ++ lib.optional (!newStdcpp) gcc48.cc;
 
   overridePkgs = with pkgs; [
+    libgpgerror
     libpulseaudio
     alsaLib
     openalSoft
@@ -93,18 +94,18 @@ let
                else overridePkgs;
   steamRuntime = lib.optional (!nativeOnly) steam-runtime;
 
+  allPkgs = ourRuntime ++ steamRuntime;
+
 in stdenv.mkDerivation rec {
   name = "steam-runtime-wrapped";
 
-  allPkgs = ourRuntime ++ steamRuntime;
-
   nativeBuildInputs = [ perl ];
 
   builder = ./build-wrapped.sh;
 
   installPhase = ''
-    buildDir "${toString steam-runtime.libs}" "$allPkgs"
+    buildDir "${toString steam-runtime.libs}" "${toString (map lib.getLib allPkgs)}"
-    buildDir "${toString steam-runtime.bins}" "$allPkgs"
+    buildDir "${toString steam-runtime.bins}" "${toString (map lib.getBin allPkgs)}"
   '';
 
   meta.hydraPlatforms = [];