fix for OpenJPEG Bug#989775: CVE-2021-3575

[Andrew C Aitchison]

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OpenJPEG 2.5.1 has been released
    https://groups.google.com/g/openjpeg/c/othStX49Yc8
and includes a fix
    https://github.com/uclouvain/openjpeg/pull/1509
for CVE-2021-3575.

-- 
Andrew C. Aitchison                         Kendal, UK
                    andrew at aitchison.me.uk