unixtools: set pname and version (#480487)

pkgs/top-level/unixtools.nix

@@ -42,9 +42,9 @@ let
           priority = 10;
           platforms = platforms.${stdenv.hostPlatform.parsed.kernel.name} or platforms.all;
         };
+        inherit (provider) version pname;
         passthru = {
           inherit provider;
-          inherit (provider) version;
         }
         // lib.optionalAttrs (builtins.hasAttr "binlore" providers) {
           binlore.out = (binlore.synthesize (getBin bins.${cmd}) providers.binlore);
@@ -74,9 +74,7 @@ let
   more_compat =
     runCommand pkgs.less.name
       {
-        passthru = {
-          inherit (pkgs.less) version;
-        };
+        inherit (pkgs.less) version pname;
       }
       ''
         mkdir -p $out/bin
@@ -267,8 +265,7 @@ let
   makeCompat =
     pname: paths:
     buildEnv {
-      name = "${pname}-${version}";
-      inherit paths;
+      inherit paths pname version;
     };
 
   # Compatibility derivations