SVN_SILENT do not issue unuseful compile warnings when using poppler <= 0.8.x

svn path=/trunk/KDE/kdegraphics/okular/; revision=852081

generators/poppler/generator_pdf.cpp

@@ -833,6 +833,9 @@ void PDFGenerator::requestFontData(const Okular::FontInfo &font, QByteArray *dat
 #ifdef HAVE_POPPLER_0_9
     Poppler::FontInfo fi = font.nativeId().value<Poppler::FontInfo>();
     *data = pdfdoc->fontData(fi);
+#else
+    Q_UNUSED( font )
+    Q_UNUSED( data )
 #endif
 }