unload_datafile - Frees all the objects in a datafile. Allegro game
programming library.
#include <allegro.h>
void unload_datafile(DATAFILE *dat);
Frees all the objects in a datafile. Use this to avoid memory leaks in
your program.
load_datafile(3alleg), excustom(3alleg), exdata(3alleg),
exexedat(3alleg), exgui(3alleg), exsprite(3alleg), exunicod(3alleg)