[Bug 797086] matroskamux: don't store used UIDs

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797086

--- Comment #8 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
GLib have it's own RNG, which is documented not recommended for crypto. It's
seeded from urandom on Linux, rand_s on Win32 and wallclock time otherwise. But
this is not crypto, we just want to avoid collision, we don't care if one can
predict the values. That UID cache was initially global, so it's not the first
time it becomes a bottleneck. I think the explanation for the change are fair
enough, and will improve performance over long period of time.

https://gitlab.gnome.org/GNOME/glib/blob/master/glib/grand.c#L62

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