am 32e9d5c0: am 9991726a: am 9b24ebf9: Test that icu4c only uses the Gregorian calendar when formatting date ranges for us.

* commit '32e9d5c059d5f7e690dbfa2f3a9ffa975ddc319d':
  Test that icu4c only uses the Gregorian calendar when formatting date ranges for us.