samba: avoid shebang patching by using correct pythonWrap

As explained in #480392, the shebangs need fixing not because of samba's
build system, but because our `wrapPythonPrograms` is buggy.

pkgs/servers/samba/4.x.nix

@@ -35,6 +35,7 @@
   rpcsvc-proto,
   bash,
   python3Packages,
+  pkgsHostTarget,
   nixosTests,
   libiconv,
   testers,
@@ -113,7 +114,10 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [
     python3Packages.python
-    python3Packages.wrapPython
+    # Not `python3Packages.wrapPython` to workaround
+    # `python3Packages.wrapPython.__spliced.buildHost` having the wrong
+    # `pythonHost`. See https://github.com/NixOS/nixpkgs/issues/434307
+    pkgsHostTarget.python3Packages.wrapPython
     wafHook
     pkg-config
     bison
@@ -310,15 +314,6 @@ stdenv.mkDerivation (finalAttrs: {
 
     # Fix PYTHONPATH for some tools
     wrapPythonPrograms
-
-    # Samba does its own shebang patching, but uses build Python
-    find $out/bin -type f -executable | while read file; do
-      isScript "$file" || continue
-      substituteInPlace "$file" \
-        --replace-fail \
-          ${lib.getBin buildPackages.python3Packages.python} \
-          ${lib.getBin python3Packages.python}
-    done
   '';
 
   disallowedReferences = lib.optionals isCross [