Upgrade to pa_stable_v190700_20210406
    
    - Upgraded the source package
    - Rebuilt the audacity patch based on the upgraded source package
    - Deleted obsolete portaudio-pipewire-jacknames.patch
    - Fixed a minor bug in the audacity patch that mixed up the alsa and oss
      build options (didn't matter, because we enable both of them)
    - Update sources file and replace MD5 with SHA512 hash