variants: support 'no' modifier for variants
variants: support 'no' modifier for variants

Use positive variants and allow a 'no' modifier for them

atsushieno/cerbero,EricssonResearch/cerbero,ikonst/cerbero,AlertMe/cerbero,shoreflyer/cerbero,flexVDI/cerbero,superdump/cerbero,ford-prefect/cerbero,GStreamer/cerbero,multipath-rtp/cerbero,davibe/cerbero,nzjrs/cerbero,fluendo/cerbero,atsushieno/cerbero,superdump/cerbero,atsushieno/cerbero,fluendo/cerbero,justinjoy/cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,justinjoy/cerbero,ikonst/cerbero,GStreamer/cerbero,multipath-rtp/cerbero,fluendo/cerbero,flexVDI/cerbero,atsushieno/cerbero,ramaxlo/cerbero,nzjrs/cerbero,atsushieno/cerbero,multipath-rtp/cerbero,flexVDI/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,OptoFidelity/cerbero,fluendo/cerbero,nzjrs/cerbero,ikonst/cerbero,nirbheek/cerbero-old,davibe/cerbero,ford-prefect/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,brion/cerbero,ford-prefect/cerbero,davibe/cerbero,ramaxlo/cerbero,AlertMe/cerbero,jackjansen/cerbero,nirbheek/cerbero,centricular/cerbero,OptoFidelity/cerbero,nirbheek/cerbero,AlertMe/cerbero,sdroege/cerbero,fluendo/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,davibe/cerbero,jackjansen/cerbero,nirbheek/cerbero-old,justinjoy/cerbero,ramaxlo/cerbero,centricular/cerbero,nzjrs/cerbero,AlertMe/cerbero,nirbheek/cerbero-old,nzjrs/cerbero,centricular/cerbero,brion/cerbero,ramaxlo/cerbero,shoreflyer/cerbero,justinjoy/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,GStreamer/cerbero,centricular/cerbero,AlertMe/cerbero,sdroege/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,nirbheek/cerbero,sdroege/cerbero,ikonst/cerbero,EricssonResearch/cerbero,brion/cerbero,GStreamer/cerbero,lubosz/cerbero,OptoFidelity/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,lubosz/cerbero,lubosz/cerbero,shoreflyer/cerbero,GStreamer/cerbero,shoreflyer/cerbero,sdroege/cerbero,nirbheek/cerbero,shoreflyer/cerbero,ramaxlo/cerbero,jackjansen/cerbero,jackjansen/cerbero,superdump/cerbero,brion/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,superdump/cerbero,flexVDI/cerbero,lubosz/cerbero,EricssonResearch/cerbero,OptoFidelity/cerbero,centricular/cerbero,EricssonResearch/cerbero,ikonst/cerbero,ford-prefect/cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,sdroege/cerbero,brion/cerbero,multipath-rtp/cerbero