Remove THRMISC_VERSION. The thrmisc structure doesn't include a version

number, so this wasn't used (and can't easily be added).  If at some point
we want to extend thrmisc, we will probably need to just add a new note
type and ensure that the new type includes a version number.

Discussed with:	kib
MFC after:	2 weeks

sys/sys/procfs.h

@@ -80,8 +80,6 @@ typedef struct prpsinfo {
     char	pr_psargs[PRARGSZ+1];	/* Arguments, null terminated (1) */
 } prpsinfo_t;
 
-#define THRMISC_VERSION		1	/* Current version of thrmisc_t */
-
 typedef struct thrmisc {
     char	pr_tname[MAXCOMLEN+1];	/* Thread name, null terminated (1) */
     u_int	_pad;			/* Convenience pad, 0-filled (1) */