minimp3 version as of 2017-04-25 from
http://keyj.emphy.de/files/projects/minimp3.tar.gz .
The following changes have been made:
- mp3_create() declaration has been fixed.
- GET_DATA() has been rewritten to avoid unaligned access warnings.
- Signed/unsigned comparison warnings have been fixed.
- Modifications have been marked with // OpenMPT
- Obviously, unnecessary folders and files have been removed.
- For building, premake is used to generate Visual Studio project files.
  See ../build/premake/ for details.