Update to 5.3100
    
    - New upstream release 5.3100
      - Move code to github
      - Fixed a bug where complex -E search patterns containing '\/' would fail to
        match emails properly (http://bugs.debian.org/432083)
      - Add POD test
      - Update tests to use Config{perlpath} for better compatibility with
        automated testing
      - Prevent MakeMaker from recursing into any "old" directory
      - Fix t/invalid_date.t to work even when Date::Manip is not installed
      - Fix t/nonexistent_mailbox.t - broken STDIN does not cause $SIG{PIPE}
      - Added lzip support (http://sourceforge.net/p/grepmail/patches/8/)
      - Added xz support
      - Fix incompatibility with newer versions of Date::Manip (CPAN RT#54621)
    - Classify buildreqs by usage
    - Drop %defattr, redundant since rpm 4.4
    - Use %license where possible
    - Use DESTDIR rather than PERL_INSTALL_ROOT
    - Use %{_fixperms} macro rather than our own chmod incantation
    - Don't need to run test suite with LANG=C
    - Don't need to remove empty directories from the buildroot