or-tools: move pybind11-protobuf package into or-tools

or-tools is the only consumer of this library, and
1910563bb3 is already one instance of the
toplevel build being broken.

Absorb pybind11-protobuf into or-tools, and manage the pinning there. It
will also make it much easier to do the upcoming or-tools bump, which
will also change these version bounds.

pybind11-protobuf is not actually packaged in the version that or-tools
asks for, but trying to use that version showed it wants abseil from
2023, which has been removed from nixpkgs.

pkgs/by-name/or/or-tools/package.nix

@@ -1,4 +1,8 @@
 {
+  stdenv,
+  lib,
+  callPackage,
+
   abseil-cpp_202407,
   bzip2,
   cbc,
@@ -11,12 +15,10 @@
   gbenchmark,
   glpk,
   highs,
-  lib,
   pkg-config,
   protobuf_29,
   python3,
   re2,
-  stdenv,
   swig,
   unzip,
   zlib,
@@ -33,7 +35,9 @@ let
   abseil-cpp = abseil-cpp_202407;
   protobuf = protobuf_29.override { inherit abseil-cpp; };
   python-protobuf = python3.pkgs.protobuf5.override { inherit protobuf; };
-  pybind11-protobuf = python3.pkgs.pybind11-protobuf.override { protobuf_29 = protobuf; };
+  pybind11-protobuf = callPackage ./pybind11-protobuf.nix {
+    inherit (python3.pkgs) buildPythonPackage pybind11;
+  };
 
   # local revert of 58daf511687f191829238fc7f571e08dc9dedf56,
   # working around https://github.com/google/or-tools/issues/4911

pkgs/by-name/or/or-tools/pybind11-protobuf.nix

@@ -4,7 +4,7 @@
   buildPythonPackage,
   fetchFromGitHub,
   cmake,
-  abseil-cpp_202407, # downgrade, same reason as toplevel protobuf_29
+  abseil-cpp_202407,
   protobuf_29,
   pybind11,
   zlib,

pkgs/top-level/python-aliases.nix

@@ -310,6 +310,7 @@ mapAliases {
   py-eth-sig-utils = throw "py-eth-sig-utils has been removed because it has been marked as broken since at least November 2024."; # Added 2025-10-04
   py-scrypt = scrypt; # added 2025-08-07
   py_stringmatching = throw "'py_stringmatching' has been renamed to/replaced by 'py-stringmatching'"; # Converted to throw 2025-10-29
+  pybind11-protobuf = throw "'pybind11-protobuf' was only used by or-tools, and with some overrides, so vendored in there until it's used in other places."; # Converted to throw 2025-11-06
   pycategories = throw "'pycategories' has been removed as it was broken and unmaintained"; # added 2025-11-08
   PyChromecast = throw "'PyChromecast' has been renamed to/replaced by 'pychromecast'"; # Converted to throw 2025-10-29
   pydns = throw "'pydns' has been renamed to/replaced by 'py3dns'"; # Converted to throw 2025-10-29

pkgs/top-level/python-packages.nix

@@ -12766,8 +12766,6 @@ self: super: with self; {
 
   pybind11-abseil = callPackage ../development/python-modules/pybind11-abseil { };
 
-  pybind11-protobuf = callPackage ../development/python-modules/pybind11-protobuf { };
-
   pybind11-stubgen = callPackage ../development/python-modules/pybind11-stubgen { };
 
   pybindgen = callPackage ../development/python-modules/pybindgen { };