gst-plugins-base: use system_libs decorator in configure too
gst-plugins-base: use system_libs decorator in configure too

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