Bug#1023644: imlib2: add jpeg-xl support

[Mathieu Malaterre]

Source: imlib2
Version: 1.7.4-2

Please add jpeg-xl support:

* 
https://github.com/libjxl/libjxl/blob/main/doc/software_support.md#image-libraries

See:
* https://github.com/alistair7/imlib2-jxl

Thank you !