Which should resolve those undefined references errors with libpng.
Rebuilt zlib just to be safe.

This reverts merge request !435

This reverts commit eda30fc9

This reverts merge request !434

This reverts merge request !433

Better than not updating it at all and having a inconsistency between versions reported from the header and internal lib version.

Also update libopenmpt

This reverts commit 603d5805.

This reverts commit 56bfdb71, reversing
changes made to c29cfbef.

Added ARM/ARM64 to zlib, libpng
Added ARM/ARM64 to srb2dd/srb2sdl

Reason for this is because the SDL2 binaries live in libs/ for ease of copying. The DLLs ought to be in one location.

Should fix libgme depending on two DLLs externally.