[Bug 766760] isomp4: Use 64bit variables for elst

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766760

--- Comment #4 from Edward Hervey <bilboed at bilboed.com> ---
This also requires a unit test in the qtmux unit test for both reading and
creating version 1 elst

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