libtheora: don't allow parallel builds for theora
libtheora: don't allow parallel builds for theora

freedesktop-unofficial-mirror/gstreamer__cerbero,AlertMe/cerbero,flexVDI/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ramaxlo/cerbero,flexVDI/cerbero,jackjansen/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,nirbheek/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,EricssonResearch/cerbero,AlertMe/cerbero,ikonst/cerbero,atsushieno/cerbero,shoreflyer/cerbero,superdump/cerbero,cee1/cerbero-mac,ylatuya/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,jackjansen/cerbero-2013,OptoFidelity/cerbero,ylatuya/cerbero,ikonst/cerbero,lubosz/cerbero,GStreamer/cerbero,ramaxlo/cerbero,nicolewu/cerbero,BigBrother-International/gst-cerbero,centricular/cerbero,cee1/cerbero-mac,sdroege/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,ikonst/cerbero,ford-prefect/cerbero,jackjansen/cerbero,superdump/cerbero,brion/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,centricular/cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,jackjansen/cerbero-2013,ford-prefect/cerbero,nzjrs/cerbero,multipath-rtp/cerbero,lubosz/cerbero,justinjoy/cerbero,EricssonResearch/cerbero,nicolewu/cerbero,justinjoy/cerbero,superdump/cerbero,jackjansen/cerbero-2013,OptoFidelity/cerbero,EricssonResearch/cerbero,davibe/cerbero,brion/cerbero,justinjoy/cerbero,sdroege/cerbero,GStreamer/cerbero,davibe/cerbero,multipath-rtp/cerbero,brion/cerbero,atsushieno/cerbero,centricular/cerbero,shoreflyer/cerbero,AlertMe/cerbero,ylatuya/cerbero,ikonst/cerbero,flexVDI/cerbero,GStreamer/cerbero,shoreflyer/cerbero,GStreamer/cerbero,fluendo/cerbero,nzjrs/cerbero,AlertMe/cerbero,ramaxlo/cerbero,nirbheek/cerbero-old,BigBrother-International/gst-cerbero,justinjoy/cerbero,nirbheek/cerbero,fluendo/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,centricular/cerbero,shoreflyer/cerbero,ikonst/cerbero,OptoFidelity/cerbero,atsushieno/cerbero,sdroege/cerbero,lubosz/cerbero,centricular/cerbero,fluendo/cerbero,nirbheek/cerbero,atsushieno/cerbero,multipath-rtp/cerbero,BigBrother-International/gst-cerbero,EricssonResearch/cerbero,superdump/cerbero,nicolewu/cerbero,BigBrother-International/gst-cerbero,nzjrs/cerbero,jackjansen/cerbero,nirbheek/cerbero-old,davibe/cerbero,ylatuya/cerbero,nirbheek/cerbero-old,ramaxlo/cerbero,ford-prefect/cerbero,fluendo/cerbero,lubosz/cerbero,AlertMe/cerbero,nzjrs/cerbero,ford-prefect/cerbero,jackjansen/cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,davibe/cerbero,jackjansen/cerbero-2013,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,flexVDI/cerbero,ramaxlo/cerbero,nzjrs/cerbero,flexVDI/cerbero,BigBrother-International/gst-cerbero,jackjansen/cerbero-2013,nirbheek/cerbero,cee1/cerbero-mac,sdroege/cerbero,atsushieno/cerbero,fluendo/cerbero,cee1/cerbero-mac,brion/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,brion/cerbero,sdroege/cerbero,multipath-rtp/cerbero,OptoFidelity/cerbero,shoreflyer/cerbero