Deimplementing complications in libpng18#659

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ctruta wants to merge 3 commits intopnggroup:libpng18from ctruta:libpng18

+505-642

Commits on Feb 21, 2025

chore: Clean up remnants of the long-discontinued Win16 support
ctruta
committed
chore: Clean up the FILE * formulations in code and in documentation
ctruta
committed
Remove the vestigial support for custom API calling conventions
ctruta
committed