The source project of this merge request has been removed.
Update OpenJPEG to 2.3
Krita uses the function, opj_codec_set_threads, which is only available from 2.3 onwards.
See https://hobbes1069.fedorapeople.org/compat_reports/openjpeg2/2.1.0_to_2.3.0/compat_report.html