Update to 1.39
    
    - New upstream release 1.39
      - Replaced Params::Validate with Params::ValidationCompiler and Specio
        - In my benchmarks this makes constructing a new DateTime object about 14%%
          faster
        - However, it slows down module load time by about 100 milliseconds (1/10
          of a second) on my desktop system with a primed cache (so really
          measuring compile time, not disk load time)
      - When you pass a locale to $dt->set you will now get a warning suggesting
        you should use $dt->set_locale instead (CPAN RT#115420)
      - Bump minimum required Perl to 5.8.4 from 5.8.1
    - Use NO_PERLLOCAL=1 so we can use "make install"