python27Packages.python-otr: mark as broken

See inline comment for details.

https://hydra.nixos.org/build/115510612

CC @NixOS/nixos-release-managers

ZHF: NixOS#80379

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

@@ -24,10 +24,13 @@ buildPythonPackage rec {
 
   meta = with stdenv.lib; {
     description = "A pure python implementation of OTR";
-    homepage = https://github.com/AGProjects/otr;
+    homepage = "https://github.com/AGProjects/python-otr";
     license = licenses.lgpl21Plus;
     platforms = platforms.linux;
     maintainers = with maintainers; [ edwtjo ];
+    # The package itself does not support python3, and its transitive
+    # dependencies rely on namespace package support that does not work in
+    # Nix's python2 infra. See #74619 for details.
+    broken = true;
   };
-
 }