[Bug 749590] protection_meta: implement transform function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749590

--- Comment #6 from Philippe Normand <phil at base-art.net> ---
Yes, the default prepare_output_buffer implementation copies the read-only
buffer to a new writable buffer but the metadata is not copied over because the
meta has no transform_func (see gst_buffer_copy_into towards the end of the
function).

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