ext/calendar: Fix integer overflow in GregorianToSdn()

Author: arshidkv12

ext/calendar/tests/gh22602.phpt

@@ -4,7 +4,12 @@ Bug GH-22602: (gregoriantojd() integer overflow with INT_MAX year)
 calendar
 --FILE--
 <?php
-var_dump(gregoriantojd(5, 5, PHP_INT_MAX > 2147483647 ? 2147483647 : PHP_INT_MAX));
+$max = PHP_INT_MAX > 2147483647 ? 2147483647 : PHP_INT_MAX;
+$min = PHP_INT_MAX > 2147483647 ? -2147483648 : PHP_INT_MIN;
+
+var_dump(gregoriantojd(5, 5, $max));
+var_dump(gregoriantojd(5, 5, $min));
 ?>
---EXPECTF--
-int(%d)
+--EXPECT--
+int(0)
+int(0)