[magick-users] convert ps/pdf works on Intel Macs but not on PPC Macs

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

> On PPC Macs, gs is invoked twice,

If it fails, it tries again with different parameters.  You can try the
command yourself from the command line to determine why its failing:

  gs -q -dQUIET -dPARANOIDSAFER -dBATCH -dNOPAUSE -dNOPROMPT \
    -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=0 \
    "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r72x72" \
    -g612x792  "-sOutputFile=test.png" test.ps

Try that under PPC and see of it complains.