svg: suppress a unused warning for some compilers.
svg: suppress a unused warning for some compilers.

wavewave/lasem,wavewave/lasem,wavewave/lasem,janmarthedal/mathml2svg,janmarthedal/mathml2svg,gjtorikian/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,gjtorikian/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,wavewave/lasem