Cmocka version compatibility

LargestIntegralType is not defined in the developement version of
cmocka.h, uintmax_t is used instead.  Use LargestIntegralType if
it is defined otherwise use uintmax_t.

tests/isc/time_test.c

@@ -280,7 +280,11 @@ ISC_RUN_TEST_IMPL(isc_time_formatISO8601TZms_test) {
 	assert_int_equal(buf[16], ':');
 	assert_int_equal(buf[19], '.');
 
+#ifdef LargestIntegralType
 	LargestIntegralType plus_minus[2] = { '+', '-' };
+#else
+	uintmax_t plus_minus[2] = { '+', '-' };
+#endif
 	assert_in_set(buf[23], plus_minus, sizeof(plus_minus));
 	assert_int_equal(buf[26], ':');