4852.   [bug]           Handle strftime() failing in isc_time_formatISO8601ms.
                        Add REQUIRE's and INSIST's to isc_time_formattimestamp,
                        isc_time_formathttptimestamp, isc_time_formatISO8601,
                        isc_time_formatISO8601ms. [RT #46892]


4852.   [bug]           Add REQUIRE's and INSIST's to isc_time_formattimestamp,
                        isc_time_formathttptimestamp, isc_time_formatISO8601.
                        [RT #46892]