Fixed TIMEFIX only inserting 000000h

Turns out beacon.c:fix_beacon_time() was using the global timeval now
struct to populate its zulu timestamp on beacons, but the global now
variable was never set anywhere and not used by any other functions.

The global now struct was removed and a local zulutime timeval is now
used to populate timestamps.

Author: PhirePhly

aprx.h

@@ -169,7 +169,6 @@ extern const char *swname;
 extern const char *swversion;
 
 extern void timetick(void);
-extern struct timeval now; // Public wall lock time that can jump around
 extern struct timeval tick;  // Monotonic clock, progresses regularly from boot. NOT wall clock time.
 extern int time_reset;      // Set during ONE call cycle of prepolls
 extern int debug;

beacon.c

@@ -690,8 +690,10 @@ static void fix_beacon_time(char *txt, int txtlen)
 {
 	int hour, min, sec;
 	char hms[8];
+	struct timeval zulutime;
 
-	sec = now.tv_sec % (3600*24); // UNIX time is UTC -> no need to play with fancy timezone conversions and summer times...
+	gettimeofday(&zulutime, NULL);
+	sec = zulutime.tv_sec % (3600*24); // UNIX time is UTC -> no need to play with fancy timezone conversions and summer times...
 	hour = sec / 3600;
 	min  = (sec / 60) % 60;
 	sec  = sec % 60;