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