Fix -Z time display

https://github.com/Hamlib/Hamlib/issues/360

src/debug.c

@@ -150,10 +150,12 @@ char *date_strget(char *buf, int buflen)
 {
     char tmp[16];
     struct tm *mytm;
+    time_t t;
     struct timeval tv;
-    gettimeofday(&tv, NULL);
+    t = time(NULL);
-    mytm = gmtime(&tv.tv_sec);
+    mytm = gmtime(&t);
     strftime(buf, buflen, "%Y-%m-%d:%H:%M:%S.", mytm);
+    gettimeofday(&tv, NULL);
     sprintf(tmp, "%06ld", (long)tv.tv_usec);
     strcat(buf, tmp);
     return buf;