Log Message:
Changes 3.3.11:
- Fixed lots of possible crashes in the IT, XM, S3M, STM, STX, AMF, IMF,
  GDM and MED module loaders.
- Fixed a possible endless loop in the IT loader with malformed files.
- Fixed signed integer overflow leading to crashes in the sample loader.
- Fixed a possible crash in MMCMP depacker with malformed files.
- Fixed the broken fixed-line comment reader which might possibly lead
  to crashes, and also badly translated several song messages. The new
  code is adapted from libopenmpt.
- Support for building the Windows version using Open Watcom compiler.
- A few minor OS/2 fixes.
- CMake updates.
- Other minor fixes/tidy-ups.