(svn r3113) -Fix: The Makefile had 64bit code which was obsolete, not to say wrong.
This removes all the 64bit stuff from the Makefile. Everything should
work just fine. Also removed the warning on amd64, 64bit OpenTTD is
stable. Tnx to dst for commenting and testing on this subject.

/* $Id$ */

#ifndef THREAD_H
#define THREAD_H

typedef struct Thread Thread;

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

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

#endif /* THREAD_H */