Spec clean-up
    
    - Drop buildreq perl ≥ 0:5.005, satisfied by all Perls in living memory
    - Drop redundant buildreq perl(Test::Harness)
    - Don't need to remove empty directories from buildroot
    - Don't use macros for commands
    - Make %files list more explicit
    - Use DESTDIR rather than PERL_INSTALL_ROOT
    - Use tabs
    - Drop %defattr, redundant since rpm 4.4