Log Message:
ImageMagick: update to 7.1.0.20.

2022-01-21  7.1.0-20  <quetzlzacatenango@image...>
  * Release ImageMagick version 7.1.0-20 GIT revision 19585:2cd840776:20220121

2022-01-09  7.1.0-20  Dirk Lemstra <dirk@lem.....org>
  * Added support for ARM64 to the Visual Studio build on Windows.
  * Removed ImageMagickObject from the Windows installer.

2021-01-01  7.1.0-20  <quetzlzacatenango@image...>
  * Support seamless blending of a foreground and background image.
  * Support saliency blending of a foreground and background image.
  * Support QOI image format.
  * Perist frame delay when converting APNG to Webp (reference
    https://github.com/ImageMagick/ImageMagick/issues/4704).
  * -fx performance increase by one or two orders of magnitude (reference
    https://github.com/ImageMagick/ImageMagick/discussions/4533).
  * Add support for formatted text (reference
    https://github.com/ImageMagick/ImageMagick/discussions/4515).