NAME
       FreeSprite -- Return sprite for use by others and virtual
                                          sprite machine.

   SYNOPSIS
       FreeSprite( pick )
                    d0

        void FreeSprite( WORD );

   FUNCTION
        Mark sprite as available for others to use.
       These sprite routines are provided to ease sharing of sprite
        hardware and to handle simple cases of sprite usage and
        movement.  It is assumed the programs that use these routines
        do want to be good citizens in their hearts. ie: they will
        not FreeSprite unless they actually own the sprite.
        The Virtual Sprite machine may ignore the simple sprite machine.

   INPUTS
       pick - number in range of 0-7

   RESULTS
        sprite made available for subsequent callers of getsprite
        as well as use by Virtual Sprite Machine.

   BUGS

   SEE ALSO
       getsprite() changesprite() movesprite() graphics/sprite.h