Implement optional syslog logging using ordinary
bb_xx_msg calls, and convert networking/* to it.
The rest of bbox will be converted gradually.

diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c
index 4c69c1f..f511340 100644
--- a/networking/udhcp/leases.c
+++ b/networking/udhcp/leases.c
@@ -113,7 +113,7 @@
 
 	if (arpping(addr, server_config.server, server_config.arp, server_config.interface) == 0) {
 		temp.s_addr = addr;
-		LOG(LOG_INFO, "%s belongs to someone, reserving it for %ld seconds",
+		bb_info_msg("%s belongs to someone, reserving it for %ld seconds",
 			inet_ntoa(temp), server_config.conflict_time);
 		add_lease(blank_chaddr, addr, server_config.conflict_time);
 		return 1;