bootstrap: Add yasm for Debian squeeze
bootstrap: Add yasm for Debian squeeze

Debian squeeze has an older version of yasm than required.

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