Update to 5.503
    
    - New upstream release 5.503:
      - Avoid inappropriately untainting data (CPAN RT#67119)
      - Localise $\ to avoid parsing problems if it's set elsewhere (CPAN RT#71041)
      - Improve exorcising of filenames (CPAN RT#71677)
      - Fix potential race condition in t/Smtpsend.t (CPAN RT#68879)
      - Allow native I/O on File::Handle objects (CPAN RT#72538)
      - Add "recommends Convert::BinHex" clause to Makefile.PL (CPAN RT#72223)
      - Add module_name to Makefile.PL (CPAN RT#77138)
      - Fix "Uninitialized value" warning (CPAN RT#77190)
      - Don't run t/Smtpsend.t on systems that lack fork() (CPAN RT#77351)
      - Add "use strict" everywhere (CPAN RT#77582)
    - Don't need to remove empty directories from the buildroot
    - Drop %defattr, redundant since rpm 4.4
    - Require perl(Convert::BinHex) to support BinHex-encoded mail