[3.20] community/millipixels: fix libtiff 4.6.0t compat

backport of !67566 (merged)

assigned to @craftyguy

changed title from community/millipixels: fix libtiff 4.6.0t compat to [3.20] community/millipixels: fix libtiff 4.6.0t compat

Maybe we can skip waiting for an approval from @craftyguy here, he wrote in https://gitlab.com/postmarketOS/pmaports/-/issues/2880#note_1945844208:

nice! ya that does fix it for me. once that's merged in aports then it should get backported to 3.20 (I'm the maintainer of that in aports, and I pre-approve :P)

Alright

merged