[cairo] [PATCH] tests: fixed warnings on unused variables

[Enrico Weigelt, metux IT consult]

some variables are only used when certain features are activated -
otherwise we warning noise.

-- 

mit freundlichen Grüßen
--
Enrico, Sohn von Wilfried, a.d.F. Weigelt,
metux IT consulting
+49-151-27565287
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