Bug#991647: libisocodes: FTBFS in bullseye

[Santiago Vila]

reopen 991647
found 991647 1.2.3-1
fixed 991647 1.2.4-1
thanks
Packages in stable must build in stable.

Please make an upload to fix this in bullseye as well (or tell me how I 
can help to fix it in bullseye).

Thanks.