Fixed #6023 -- Fixed daylight savings determination for years beyond 2038 on

32-bit systems (modulo the fact that the system timezone libraries might not be
accurate that far out; at least we don't crash now). Thanks, SmileyChris.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6749 bcc190cf-cafb-0310-a4f2-bffc1f526a37