crossfire-server: Use python39 instead of python3 (#232282)

Apperently the parser used by crossfire was remove in python 3.10.

https://bugs.python.org/issue40939

pkgs/games/crossfire/crossfire-server.nix

···
-{ stdenv, lib, fetchsvn, autoreconfHook,
-  autoconf, automake, libtool, flex, perl, check, pkg-config, python3,
-  version, rev, sha256, maps, arch }:
+{ stdenv
+, lib
+, fetchsvn
+, autoreconfHook
+, autoconf
+, automake
+, libtool
+, flex
+, perl
+, check
+, pkg-config
+, python39 # crossfire-server relies on a parser wich was removed in python >3.9
+, version
+, rev
+, sha256
+, maps
+, arch
+}:
 
 stdenv.mkDerivation rec {
   pname = "crossfire-server";
···
     rev = "r${rev}";
   };
 
-  nativeBuildInputs = [ autoconf automake libtool flex perl check pkg-config python3 ];
+  nativeBuildInputs = [ autoconf automake libtool flex perl check pkg-config python39 ];
   hardeningDisable = [ "format" ];
 
   preConfigure = ''
···
     sh autogen.sh
   '';
 
-  configureFlags = [ "--with-python=${python3}" ];
+  configureFlags = [ "--with-python=${python39}" ];
 
   postInstall = ''
     ln -s ${maps} "$out/share/crossfire/maps"