[Bug 783000] tests: videoscale: Fix build warning error

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783000

--- Comment #4 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Ok, could you please investigate why this happens then?

Clearly it's not supposed to happen and it should be defined as far as I can
tell from the Makefile.am. And it is defined if I do this.

The patch just works around something that shouldn't be happening in the first
place :)

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