[ImageMagick] Add support for JPEG2000 decoding

[jochalek]

No description provided.

[giordano]

In case you haven't seen it:

ArgumentError: The archive automatically generated by GitHub
  https://github.com/ImageMagick/ImageMagick6/archive/6.9.12-62.tar.gz
may not have a stable checksum in the future, thus cannot be used as a reliable source, see
<https://github.blog/changelog/2023-01-30-git-archive-checksums-may-change/>.
Use a different source, for example a `GitSource`, or an official release artifact uploaded
by the maintainers of the package (*not* the automatic archive produced by GitHub).