Mark some risky calendar variables.

Mark some risky calendar variables.

* lisp/calendar/cal-china.el (chinese-calendar-time-zone):
Remove risky setting for deleted obsolete alias.
(calendar-chinese-standard-time-zone-name)
(calendar-chinese-daylight-saving-start)
(calendar-chinese-daylight-saving-end):
* lisp/calendar/calendar.el (calendar-iso-date-display-form)
(calendar-european-date-display-form)
(calendar-american-date-display-form, calendar-date-display-form):
* lisp/calendar/diary-lib.el (diary-remind-message)
(diary-header-line-format):
* lisp/calendar/solar.el (calendar-time-display-form)
(calendar-location-name): Mark as risky.