Fixed compile warnings from recent merge into datetime ports.

ports/bsd/datetime-init.c

@@ -30,6 +30,9 @@
 void datetime_timesync(
     BACNET_DATE *bdate, BACNET_TIME *btime, bool utc)
 {
+    (void)bdate;
+    (void)btime;
+    (void)utc;
     return;
 }
 

ports/win32/datetime-init.c

@@ -104,6 +104,9 @@ int gettimeofday(struct timeval *tp, void *tzp)
 void datetime_timesync(
     BACNET_DATE *bdate, BACNET_TIME *btime, bool utc)
 {
+    (void)bdate;
+    (void)btime;
+    (void)utc;
     return;
 }