ios: Don't use _NSGetEnviron(), it is private API on iOS
ios: Don't use _NSGetEnviron(), it is private API on iOS

https://bugzilla.gnome.org/show_bug.cgi?id=723632

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