Update libopenmpt to version 0.8.1 / rev 54 via SR 1285834
    
    https://build.opensuse.org/request/show/1285834
    by user mia + anag_factory
    - Update to 0.8.1:
      * [Bug] openmpt123: Allow for converting to libsndfile formats
        which list the file extension only in the subformat
        (i.e. MP3 with libsndfile 1.1.0 or later).
      * [Change] TCB was added to the list of supported file
        extensions. ModLand and Fujiology use this extension for
        TCB Tracker modules, instead of the canonical MOD extension.
      * IT: Fixed various interactions between Note Cut effect and
        portamentos.
      * MED: When triggering a synth note with a Synth Jump command on
        the same row, the initial speed command was not executed.
      * S3M: Old ModPlug Tracker versions allowed the 28th character
        of sample names to be used. Such sample names are now read
        correctly again.