Update to 0.38 and drop EL-5 support
    
    - New upstream release 0.38
      - Fix test prereqs; pod tests moved to xt/ (CPAN RT#122136, CPAN RT#122137)
      - Adopt new repo structure:
        - Delete MANIFEST and META.yml, and hereafter auto-generate them
        - Modernize .gitignore and MANIFEST.SKIP
        - The code says Perl licence but the LICENCE file says Artistic, so replace
          LICENCE file with LICENSE (so spelled), which says Perl
    - Drop EL-5 support
      - Drop BuildRoot: and Group: tags
      - Drop explicit buildroot cleaning in %install section
      - Drop explicit %clean section