buildGoPackage: also support pname

Following python-modules and stdenv.mkDerivation.
Hopefully zero rebuilds.

Motivation: https://github.com/NixOS/nixpkgs/pull/52409

pkgs/development/go-modules/generic/default.nix

@@ -1,7 +1,10 @@
 { go, govers, lib, fetchgit, fetchhg, fetchbzr, rsync
 , removeReferencesTo, fetchFromGitHub, stdenv }:
 
-{ name, buildInputs ? [], nativeBuildInputs ? [], passthru ? {}, preFixup ? ""
+{ buildInputs ? []
+, nativeBuildInputs ? []
+, passthru ? {}
+, preFixup ? ""
 , shellHook ? ""
 
 # We want parallel builds by default
@@ -34,7 +37,6 @@
 
 , meta ? {}, ... } @ args':
 
-if disabled then throw "${name} not supported for go ${go.meta.branch}" else
 
 with builtins;
 
@@ -72,12 +74,9 @@ let
 
   goPath = if goDeps != null then importGodeps { depsFile = goDeps; } ++ extraSrcs
                              else extraSrcs;
-in
+  package = go.stdenv.mkDerivation (
-
-go.stdenv.mkDerivation (
     (builtins.removeAttrs args [ "goPackageAliases" "disabled" ]) // {
 
-  inherit name;
     nativeBuildInputs = [ removeReferencesTo go ]
       ++ (lib.optional (!dontRenameImports) govers) ++ nativeBuildInputs;
     buildInputs = buildInputs;
@@ -238,4 +237,8 @@ go.stdenv.mkDerivation (
       maintainers = (meta.maintainers or []) ++
                     [ lib.maintainers.ehmry lib.maintainers.lethalman ];
     };
-})
+  });
+in if disabled then
+  throw "${package.name} not supported for go ${go.meta.branch}"
+else
+  package