Statically link libpng on Windows?

[ISSOtm]

This would have a few upsides:

• It's only used by a single program, so we could get some overall size reduction
• Slightly faster startup time from not having to resolve dynamic relocs
• The lib's contents can be trimmed and otherwise optimised together with the program itself (particularly with LTO)
• Much, much simpler distribution (no DLLs to gather and copy into test/gfx!)

Downsides:

• People couldn't upgrade the DLL separately (but does anyone even do that?)

[Rangi42]

I am certain that more people have had issues with missing/broken DLLs than would complain about not being able to intentionally upgrade their DLL separately from RGBDS itself. (Even assuming the latter number is nonzero.) This sounds like a useful little change!