zdtm: make -- Don't fail if symlink already exist

If symlink is present the test run fails with
"already exist" message. Lets make the link
unconditional, this is fine.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrey Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -223,7 +223,7 @@ install: all
 .PHONY: all install
 
 inotify_system_nodel.c: inotify_system.c
-	ln -s inotify_system.c inotify_system_nodel.c
+	ln -sf inotify_system.c inotify_system_nodel.c
 
 $(TST_NOFILE:%=%.pid):	%.pid:	%
 	$(<D)/$(<F) --pidfile=$@ --outfile=$<.out