[package] chrony: fix build when ipv6 is globally disabled (#11790)

git-svn-id: svn://svn.openwrt.org/openwrt/packages@33046 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/chrony/patches/002-ipv6_disabled_fixes.patch

@@ -0,0 +1,34 @@
+--- a/ntp_io.c
++++ b/ntp_io.c
+@@ -355,6 +355,7 @@ read_from_socket(void *anything)
+       }
+ #endif
+ 
++#ifdef HAVE_IPV6
+ #ifdef IPV6_PKTINFO
+       if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
+         struct in6_pktinfo ipi;
+@@ -365,6 +366,7 @@ read_from_socket(void *anything)
+         remote_addr.local_ip_addr.family = IPADDR_INET6;
+       }
+ #endif
++#endif
+ 
+ #ifdef SO_TIMESTAMP
+       if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP) {
+@@ -466,6 +468,7 @@ send_packet(void *packet, int packetlen,
+   }
+ #endif
+ 
++#ifdef HAVE_IPV6
+ #ifdef IPV6_PKTINFO
+   if (remote_addr->local_ip_addr.family == IPADDR_INET6) {
+     struct cmsghdr *cmsg;
+@@ -484,6 +487,7 @@ send_packet(void *packet, int packetlen,
+         sizeof(ipi->ipi6_addr.s6_addr));
+   }
+ #endif
++#endif
+ 
+ #if 0
+     LOG(LOGS_INFO, LOGF_NtpIO, "sending to %s:%d from %s",