[Bug 774944] iqa makes it difficult to support multiple metrics

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774944

--- Comment #1 from LRN <lrn1986 at gmail.com> ---
Created attachment 340621
  --> https://bugzilla.gnome.org/attachment.cgi?id=340621&action=edit
IQA: Rename iqa element to iqadssim

Remove do-dssim property, as iqadssim only ever does dssim
metric.
Make iqadssim compilation conditional on the dssim presence.

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