[Bug 749528] playbin: need to avoid duplicated flag setting

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749528

--- Comment #1 from Eunhae Choi <eunhae1.choi at samsung.com> ---
Created attachment 303504
  --> https://bugzilla.gnome.org/attachment.cgi?id=303504&action=edit
playbin: check flags of playsink before updating

Add duplication checking code about flags of playsink to avoid reconfigure
playsink repeatedly.

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