Update to 0.26
    
    - New upstream release 0.26:
      - Fix bug in Makefile.PL when ExtUtils::CBuilder not available
    - This release by HAARG -> update source URL
    - Clean up for modern rpmbuild since build requirements are not available in
      EL-5
    - Drop obsoletes/provides for old tests sub-package
    - Drop unnecessary %perl_ext_env_unset macro usage
    - Add optional test requirements