tools/nolibc/stdlib: make raise() use the lower level syscalls only

raise() doesn't set errno, so there's no point calling kill(), better
call sys_kill(), which also reduces the function's size.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/include/nolibc/stdlib.h

@@ -317,7 +317,7 @@ int msleep(unsigned int msecs)
 __attribute__((weak,unused))
 int raise(int signal)
 {
-	return kill(getpid(), signal);
+	return sys_kill(sys_getpid(), signal);
 }
 
 static __attribute__((unused))