makefile: exclude debian.py from pep8 check
makefile: exclude debian.py from pep8 check

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