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threadimpl: remove unused fields from Proc struct

--- a/sys/src/libthread/threadimpl.h

+++ b/sys/src/libthread/threadimpl.h

@@ -120,15 +120,8 @@

 	Tqueue		ready;			/* Runnable threads */

 	Lock		readylock;

-	char		printbuf[Printsize];

-	int		blocked;		/* In a rendezvous */

 	int		pending;		/* delayed note pending */

-	int		nonotes;		/*  delay notes */

-	uint		nextID;			/* ID of most recently created thread */

 	Proc		*next;			/* linked list of Procs */

-

-	void		*arg;			/* passed between shared and unshared stk */

-	char		str[ERRMAX];		/* used by threadexits to avoid malloc */

 	void*		udata;			/* User per-proc data pointer */

 	char		threadint;		/* tag for threadexitsall() */