packager: osx: bundle: only create main lib if it exists
packager: osx: bundle: only create main lib if it exists

only try to copy the main framework library if it has already been
created

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