Fixed #6666: Corrected a bind param formatting issue when performing 'year'...

Fixed #6666: Corrected a bind param formatting issue when performing 'year' lookups on DateFields using Oracle.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7274 bcc190cf-cafb-0310-a4f2-bffc1f526a37