This updates Krita from 5.1.5 to 5.2.1, with extra package dependencies
from:

- [bug#67342] Add kfkdcraw : https://patches.guix-patches.cbaines.net/project/guix-patches/patch/87r0kiu8u5.fsf@gmail.com/
- [bug#67343] Add fftw-cmake : https://patches.guix-patches.cbaines.net/project/guix-patches/patch/87o7fmu8or.fsf@gmail.com/

Please apply these patches first before testing this patch.

The fftw-cmake patch aims to address some missing FFTW Cmake files,
during the Krita configure stage, but sadly it still does not find them.

I'm submitting this patch in the hopes that someone can help debug this
issue further. I've CC'd the mentors teams.

Below is the current state of the patch.