python3Packages.django_4: patch in zoneinfo directory

Closes: #187388

pkgs/development/python-modules/django/4.nix

@@ -58,6 +58,10 @@ buildPythonPackage rec {
       hash = "sha256-QE7QnfYAK74wvK8gDJ15FtQ+BCIWRQKAVvM7v1FzwlE=";
       excludes = [ "docs/releases/4.1.1.txt" ];
     })
+    (substituteAll {
+      src = ./django_4_set_zoneinfo_dir.patch;
+      zoneinfo = tzdata + "/share/zoneinfo";
+    })
   ] ++ lib.optionals withGdal [
     (substituteAll {
       src = ./django_4_set_geos_gdal_lib.patch;

pkgs/development/python-modules/django/django_4_set_zoneinfo_dir.patch

@@ -0,0 +1,13 @@
+diff --git a/django/conf/__init__.py b/django/conf/__init__.py
+index cb70a71791..5156f7dd73 100644
+--- a/django/conf/__init__.py
++++ b/django/conf/__init__.py
+@@ -227,7 +227,7 @@ class Settings:
+         if hasattr(time, "tzset") and self.TIME_ZONE:
+             # When we can, attempt to validate the timezone. If we can't find
+             # this file, no check happens and it's harmless.
+-            zoneinfo_root = Path("/usr/share/zoneinfo")
++            zoneinfo_root = Path("@zoneinfo@")
+             zone_info_file = zoneinfo_root.joinpath(*self.TIME_ZONE.split("/"))
+             if zoneinfo_root.exists() and not zone_info_file.exists():
+                 raise ValueError("Incorrect timezone setting: %s" % self.TIME_ZONE)