[magick-users] -kerning not works in ver 6.4.7

[duc.sequere.aut.de.via.decede at imagemagick.org]

> convert -pointsize 12 -kerning 1    label:Anthony   label_kerning_1.gif

The kerning option is a recent addition.  Grab the latest release of
ImageMagick 6.4.7-10.  It works for us.