Stuff that needs to be done and wishlist:

- autoconf?
- update the Makefile so that Cygwin can generate a DLL. The entire codebase
  compiles under Cygwin otherwise.
- Hmm...we can determine the actual CD-ROM drives under Win32, but how do you
  decide that there's no disc in the drive?
- MacOS (Classic and X) support.
- Move the integer types to something abstract. uint32, etc.
- Platform-specific functions/macros to handle byte ordering.
- A PHYSFS_readUint32(), _readSint32(), etc API.
- Ditch the "standard" i/o routines (fopen() and friends) and move this into
  the platform drivers.

// end of TODO ...