Fix incorrect reference clock being selected on startup on Linux.

Closes #3238. Thanks to Eric Guin and karlri.
Closes #3168.

ChangeLog.txt

@@ -10,6 +10,8 @@ Broker:
 - Fix crash on receiving a $CONTROL message over a bridge, if
   per_listener_settings is set true and the bridge is carrying out topic
   remapping. Closes #3261.
+- Fix incorrect reference clock being selected on startup on Linux.
+  Closes #3238.
 
 Client library:
 - Fix C++ symbols being removed when compiled with link time optimisation.

src/mosquitto.c

@@ -465,6 +465,7 @@ int main(int argc, char *argv[])
 #endif
 	struct mosquitto *ctxt, *ctxt_tmp;
 
+	mosquitto_time_init();
 #if defined(WIN32) || defined(__CYGWIN__)
 	if(argc == 2){
 		if(!strcmp(argv[1], "run")){