[Bug 777643] streamcollection: Supposed to be immutable but nothing enforcing that

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777643

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Let's go with a sealing function and boolean, it makes it impossible to unseal
it again.

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