intl: add intlcal_set_minimal_days_in_first_week()

and IntlCalendar::setMinimalDaysInFirstWeek(). This one had slipped.
we had a ::getMinimalDaysInFirstWeek() but no way to change the value.
intl: fix extra space in constant name
Merge branch 'PHP-5.5'

* PHP-5.5:
  intl: fix extra space in constant name
  intl: add intlcal_set_minimal_days_in_first_week()