swiProlog: disable format hardening

pkgs/development/compilers/swi-prolog/default.nix

···
   buildInputs = [ gmp readline openssl libjpeg unixODBC libXinerama
     libXft libXpm libSM libXt zlib freetype pkgconfig fontconfig ];
 
+  hardening_format = false;
+
   configureFlags = "--with-world --enable-gmp --enable-shared";
 
   buildFlags = "world";