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.

This reverts commit 720a1212.

This reverts commit eafed06a.