[Bug 789151] add support for iOS 11

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789151

--- Comment #8 from Nicola <lists at svrinformatica.it> ---
Created attachment 362104
  --> https://bugzilla.gnome.org/attachment.cgi?id=362104&action=edit
orc: redefine system on iOS11

on iOS 11 system is not defined, this patch fixs the issue in orc itself, if
you want I can provide a cerbero patch too

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