[Bug 793030] Add support for Ubuntu 17.10

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793030

--- Comment #6 from Xavier Claessens <xclaesse at gmail.com> ---
Created attachment 367657
  --> https://bugzilla.gnome.org/attachment.cgi?id=367657&action=edit
fontconfig: Update to 2.12.6

This fix build issue with glibc >= 2.25.

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