utils: Properly detect RHEL (Red Hat Enterprise Linux)
utils: Properly detect RHEL (Red Hat Enterprise Linux)

https://bugzilla.gnome.org/show_bug.cgi?id=720132

flexVDI/cerbero,AlertMe/cerbero,fluendo/cerbero,GStreamer/cerbero,AlertMe/cerbero,fluendo/cerbero,jackjansen/cerbero,nirbheek/cerbero-old,jackjansen/cerbero,justinjoy/cerbero,nirbheek/cerbero,jackjansen/cerbero,nirbheek/cerbero,superdump/cerbero,multipath-rtp/cerbero,centricular/cerbero,atsushieno/cerbero,shoreflyer/cerbero,ikonst/cerbero,AlertMe/cerbero,flexVDI/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ikonst/cerbero,multipath-rtp/cerbero,EricssonResearch/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,sdroege/cerbero,flexVDI/cerbero,superdump/cerbero,GStreamer/cerbero,OptoFidelity/cerbero,sdroege/cerbero,nirbheek/cerbero-old,EricssonResearch/cerbero,justinjoy/cerbero,shoreflyer/cerbero,GStreamer/cerbero,shoreflyer/cerbero,fluendo/cerbero,ikonst/cerbero,justinjoy/cerbero,flexVDI/cerbero,ford-prefect/cerbero,justinjoy/cerbero,ikonst/cerbero,AlertMe/cerbero,multipath-rtp/cerbero,nirbheek/cerbero-old,sdroege/cerbero,lubosz/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,centricular/cerbero,ramaxlo/cerbero,atsushieno/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,nzjrs/cerbero,ford-prefect/cerbero,OptoFidelity/cerbero,EricssonResearch/cerbero,ramaxlo/cerbero,superdump/cerbero,centricular/cerbero,fluendo/cerbero,nzjrs/cerbero,GStreamer/cerbero,multipath-rtp/cerbero,shoreflyer/cerbero,ford-prefect/cerbero,centricular/cerbero,OptoFidelity/cerbero,sdroege/cerbero,shoreflyer/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,lubosz/cerbero,OptoFidelity/cerbero,multipath-rtp/cerbero,atsushieno/cerbero,superdump/cerbero,nzjrs/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,ramaxlo/cerbero,nirbheek/cerbero,ramaxlo/cerbero,fluendo/cerbero,GStreamer/cerbero,AlertMe/cerbero,nzjrs/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,ford-prefect/cerbero,nirbheek/cerbero,flexVDI/cerbero,ikonst/cerbero,lubosz/cerbero,jackjansen/cerbero,sdroege/cerbero,nirbheek/cerbero-old,nzjrs/cerbero,lubosz/cerbero,atsushieno/cerbero,ramaxlo/cerbero,centricular/cerbero,EricssonResearch/cerbero