Update to v1.5.0
    
    - New upstream release v1.5.0
      - Readonly::XS is no longer needed
      - Typo fix (CPAN RT#86350)
      - Array and Hash scalar references were not made deeply readonly
        (CPAN RT#37864)
      - Upstream magic related bugs were reported to p5p and fixed in perl itself
        so we can resolve the following local issues:
        - CPAN RT#24216 ('looks_like_number' doesn't handle Readonly properly)
        - CPAN RT#29487 (magical variable bug in perl 5.8.5)
        - CPAN RT#36653 (Readonly scalar as class name sometimes undefined)
        - CPAN RT#57382 (tie-related bug in perl's core)
        - CPAN RT#70167 (unaccessed read-only variables are undef in select calls)
      - Reported Perl RT#120122 (tie + smartmatch bug) upstream to p5p; will
        eventually resolve local (CPAN RT#59256)
      - Use readonly support exposed in Internals on perl ≥ 5.8.0
      - Checking Readonly::XS::Okay is no longer suggested... never should have
        been
    - Update shellbang patch