Log Message:
Changes 3.3.7:
- Android support, thanks to Radovan Cervenka, with the OpenSL ES
  driver adapted from the old libmikmod-android project.
- Support for AmigaOS and its variants like MorphOS, AROS, and a new
  AHI driver thanks to Szilárd Biró.
- Build system configuration and packaging simplifications, tidy-ups.
- Several portability tweaks.
- New PSP driver. (untested. suggested by Jon Daniel, based on older
  ports from pspdev.)
- Fix some OS/2 bit rot. (for nostalgia...)