Spec tidy-up
- Use author-independent source URL
- Classify buildreqs by usage
- Drop redundant %{?perl_default_filter}
- Drop redundant specification of compiler flags for noarch package
- Use DESTDIR rather than PERL_INSTALL_ROOT
- Simplify find command using -delete
- Don't need to remove empty directories from the buildroot
- Fix permissions verbosely
- Package the Changes file