(svn r4901) - Codechange: change 'SpriteGroup *' to 'struct SpriteGroup *' within StationSpec and GRFFile struct declarations. Now only code which actually references those pointers needs to know about the SpriteGroup struct. Remove some unnecessary lingering header dependencies.

/* $Id$ */

#ifndef THREAD_H
#define THREAD_H

typedef struct Thread Thread;

typedef void* (*ThreadFunc)(void*);

Thread* OTTDCreateThread(ThreadFunc, void*);
void*   OTTDJoinThread(Thread*);

#endif /* THREAD_H */