Sync NBSD libc errno.h with minix errno.h

This patch fixes some wrong error code number in nbsd libc's sys/errno.h
and adds new ones.

As in NetBSD the errno.h is used to automatically generate errlist.c array,
EBADCPU set to 1000 to be a bit too large, so we instruct the awk script
to stop at EDEADEPT (ELAST).

lib/nbsd_libc/gen/errlist-minix.awk

@@ -73,11 +73,16 @@ BEGIN {
 	}
 	perror("ENOERROR", 0, "Undefined error: 0");
 	errno = 1;
+	last = 0;
 }
 /^#define/ {
+	if ( last ) next;
+
 	name = $2;
-	if (name == "ELAST")
+	if (name == "ELAST") {
+		last = 1;
 		next;
+	}
 	number = $4;
 	if (number < 0 || number == "EAGAIN")
 		next;