Fix memory leak in cairo TextLayout::draw.

Destroy cairo_font_options when done.

Change-Id: Ib49c07dee22fa59b4f6227c6b106a18b615aa060
Reviewed-on: https://gerrit.libreoffice.org/4193
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

canvas/source/cairo/cairo_textlayout.cxx

@@ -572,6 +572,7 @@ namespace cairocanvas
 
             cairo_restore( pSCairo.get() );
             cairo_font_face_destroy(font_face);
+            cairo_font_options_destroy(options);
         }
         return true;
     }