[Bug 757653] pad: add flag to disable reconfigure event on pad linking

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757653

--- Comment #9 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Hi, updated and re-run my scripts. It reduces the queries from 102 to 94 and
the gains on a desktop are marginal. The other thing this patch used to do was
avoid an extra bufferpool being re-negotiated but without the playsink bits
this isn't working.

Mostly the renegotiation is caused by linking the convertbin elements and
playsink, this happens after the decoder has started its first bufferpool, so
it ends up asking for a new one with the exact same configurations. Because of
the way bufferpools need to be activated and deactivated it is hard to have the
allocation query return the same bufferpool again.

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