Threadkill and threadkillgrp return void, but current man pages 
say that they return int.

* important * 
The troff source I have submitted is wrong. I cannot edit it now. 
I changed  threadintgrp  instead of  threadkillgrp. Sorry.

Reference: /n/sources/patch/applied/libthread_manpage
Date: Mon Mar 26 16:17:04 CES 2007
Signed-off-by: esoriano@lsub.org

--- /sys/man/2/thread	Mon Mar 26 16:08:20 2007
+++ /sys/man/2/thread	Mon Mar 26 16:08:16 2007
@@ -89,8 +89,8 @@
 int	threadpid(int id)
 .XX
 int	threadint(int id)
-int	threadintgrp(int group)
-int	threadkill(int id)
+void	threadintgrp(int group)
+void	threadkill(int id)
 int	threadkillgrp(int group)
 .XX
 void	threadsetname(char *name)