parse-date: fix printf format

warning on 32bit systems:
../lib/parse-date.y: In function 'parse_date':
../lib/parse-date.y:1509:7: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'intmax_t' [-Wformat=]
       abs_time_zone_min);
       ^

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

lib/parse-date.y

@@ -1503,7 +1503,7 @@ int parse_date(struct timespec *result, char const *p,
 
 				if (!tz_was_altered)
 					tz0 = get_tz (tz0buf);
-				sprintf (tz1buf, "XXX%s%ld:%02d",
+				sprintf (tz1buf, "XXX%s%jd:%02d",
 					 &"-"[time_zone < 0],
 					 abs_time_zone_hour,
 					 abs_time_zone_min);