[Bug 751450] parse/grammar.y: Allow multiple links to happen.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751450

--- Comment #8 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
I attached a tentative patch with a new token, '?', if everyone is all right
with it I'll update the documentation.

It would also be comforting if someone with more flex / bison experience than I
reviewed this patch.

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