busybox: add ntp patch for 1.20.2

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/busybox/busybox-1.20.2/busybox-1.20.2-ntpd.patch

@@ -0,0 +1,11 @@
+--- busybox-1.20.2/networking/ntpd.c
++++ busybox-1.20.2-ntpd/networking/ntpd.c
+@@ -1840,7 +1840,7 @@ recv_and_process_client_pkt(void /*int f
+ 
+ 	/* Build a reply packet */
+ 	memset(&msg, 0, sizeof(msg));
+-	msg.m_status = G.stratum < MAXSTRAT ? G.ntp_status : LI_ALARM;
++	msg.m_status = G.stratum < MAXSTRAT ? (G.ntp_status & LI_MASK) : LI_ALARM;
+ 	msg.m_status |= (query_status & VERSION_MASK);
+ 	msg.m_status |= ((query_status & MODE_MASK) == MODE_CLIENT) ?
+ 			 MODE_SERVER : MODE_SYM_PAS;