Relax test expectation

Since we're dealing with floating point numbers, precision issues may
hit us, and actually it's not necessary to check for the exact number
anyway, because it is not exact in the first place.  Therefore, we
relax the test expectations.

Author: cmb69

ext/intl/tests/bug79212.phpt

@@ -13,6 +13,6 @@ var_dump($fmt->format(gmp_init('823749273428379492374')));
 $fmt = new NumberFormatter('en_US', NumberFormatter::PATTERN_DECIMAL);
 var_dump($fmt->format([1], NumberFormatter::TYPE_INT64));
 ?>
---EXPECT--
-string(21) "823749273428379400000"
+--EXPECTF--
+string(21) "823749273428379%c%c%c%c%c%c"
 string(1) "1"