python3Minimal: remove dependency on libffi

This makes python3Minimal mor minimal

When working on https://github.com/NixOS/nixpkgs/pull/405822 I assumed that libffi was a mandatory dependency of python, but it's not.

pkgs/development/interpreters/python/default.nix

@@ -4,7 +4,6 @@
   config,
   db,
   lib,
-  libffiBoot,
   makeScopeWithSplicing',
   pythonPackagesExtensions,
   stdenv,
@@ -117,7 +116,7 @@
           libxcrypt = null;
           xz = null;
           zlib = null;
-          libffi = libffiBoot; # without test suite
+          libffi = null;
           stripConfig = true;
           stripIdlelib = true;
           stripTests = true;
@@ -136,7 +135,6 @@
           */
           allowedReferenceNames = [
             "bashNonInteractive"
-            "libffi"
           ];
         }
         // sources.python313

pkgs/top-level/all-packages.nix

@@ -8709,9 +8709,6 @@ with pkgs;
   libffiReal = callPackage ../development/libraries/libffi { };
   libffi = if stdenv.hostPlatform.isDarwin then darwin.libffi else libffiReal;
   libffi_3_3 = callPackage ../development/libraries/libffi/3.3.nix { };
-  libffiBoot = libffi.override {
-    doCheck = false;
-  };
 
   # https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgpg-error.git;a=blob;f=README;h=fd6e1a83f55696c1f7a08f6dfca08b2d6b7617ec;hb=70058cd9f944d620764e57c838209afae8a58c78#l118
   libgpg-error-gen-posix-lock-obj = libgpg-error.override {