Update to 3.73
    
    - New upstream release 3.73
      - Move pod to separate file, to further improve loading times
      - Make it arch-specific, adding a test that warns when an old version is
        still installed
      - Due to a logic glitch, warnings were not enabled at all on 5.16
      - Remove "deprecated", as it turned out to be yet another time bomb as p5p
        don't care the least about backwards compatibility anymore
        (https://rt.perl.org/Public/Bug/Display.html?id=119123)
    - Manually generate the manpage so we get a non-empty one