kill: implement killall5. OpenWRT folks will be happy.
However their code was unusably different from sysvinit original.
Run tested.
diff --git a/procps/Config.in b/procps/Config.in
index 2183fab..2d4ad3b 100644
--- a/procps/Config.in
+++ b/procps/Config.in
@@ -38,6 +38,11 @@
 	  specified commands.  If no signal name is specified, SIGTERM is
 	  sent.
 
+config CONFIG_KILLALL5
+	bool "killall5"
+	default n
+	depends on CONFIG_KILL
+	
 config CONFIG_PIDOF
 	bool "pidof"
 	default n