[Bug 784195] Bump up m4 version to 1.4.18

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784195

--- Comment #1 from Justin J. Kim <justin.joy.9to5 at gmail.com> ---
Created attachment 354438
  --> https://bugzilla.gnome.org/attachment.cgi?id=354438&action=edit
update to 1.4.18

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