autoPatchelfHook: allow building on all platforms (#308994)

* python3.pkgs.pyelftools: fix license metadata

* autoPatchelfHook: allow building on all platforms

This change allows using autoPatchelfHook in nativeBuildInputs when
cross-compiling from non-Linux platform. Technically, the hook is
platform-independent and only limited by the dependencies, namely
patchelf (`platforms = all`) and pyelftools (inherits from python, that
is, `platforms = linux ++ darwin ++ windows`).

---------

Co-authored-by: Guillaume Maudoux <guillaume.maudoux@tweag.io>

pkgs/development/python-modules/pyelftools/default.nix

@@ -38,12 +38,18 @@ buildPythonPackage rec {
     "elftools"
   ];
 
-  meta = with lib; {
+  meta = {
     description = "Python library for analyzing ELF files and DWARF debugging information";
     homepage = "https://github.com/eliben/pyelftools";
     changelog = "https://github.com/eliben/pyelftools/blob/v${version}/CHANGES";
-    license = licenses.publicDomain;
-    maintainers = with maintainers; [ igsha pamplemousse ];
+    license = with lib.licenses; [
+      # Public domain with Unlicense waiver.
+      unlicense
+      # pyelftools bundles construct library that is licensed under MIT license.
+      # See elftools/construct/{LICENSE,README} in the source code.
+      mit
+    ];
+    maintainers = with lib.maintainers; [ igsha pamplemousse ];
     mainProgram = "readelf.py";
   };
 }

pkgs/top-level/all-packages.nix

@@ -193,7 +193,6 @@ with pkgs;
       pythonInterpreter = "${python3.withPackages (ps: [ ps.pyelftools ])}/bin/python";
       autoPatchelfScript = ../build-support/setup-hooks/auto-patchelf.py;
     };
-    meta.platforms = lib.platforms.linux ++ lib.platforms.freebsd;
   } ../build-support/setup-hooks/auto-patchelf.sh;
 
   tomato-c = callPackage ../applications/misc/tomato-c { };