Update to 3.3.61
    
    - New upstream release 3.3.61
      - Parameterized number of named markers, so that --enable-manymarkers at
        configure time allows up to 702 named markers instead of 26 (disabled by
        default)
      - Updated LZ4 for version r118
      - Fixed broken VCD/TIM export in Windows (broken by new file requester)