Log Message:
Upgrade to ImageMagick version 7.0.5-6.

Upstream changes:
2017-05-12  7.0.5-6 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 7.0.5-6, GIT revision 20039:9371904:20170512.

2017-05-10  7.0.5-6 John Cupitt <jcupitt@gmail.com>
  * Revise DICOM window and rescale handling (reference
    https://github.com/ImageMagick/ImageMagick/pull/484)

2017-05-06  7.0.5-6 Cristy  <quetzlzacatenango@image...>
  * Restore the -alpha Shape option (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31879).
  * Fix transient PDF bug (reference
    https://github.com/ImageMagick/ImageMagick/issues/463).
  * The +opaque option now works on all channels (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31862).
  * Ensure backwards compatibility for the -combine option (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31855).
  * Check for EOF conditions for RLE image format.
  * Reset histogram page geometry (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31920).