Add support for the JACK Audio Connection Kit

Packages describing “jack” as local USE flag

Package “jack” Flag Description
media-video/pipewire Enable SPA JACK plugin and emulation to be able to run JACK applications on top of PipeWire
media-tv/mythtv Allows MythTV to use JACK as your sound output device
media-sound/denemo Enable jack support through virtual/jack

All packages providing a “jack” USE flag (81)