Skip test case on x86 where it otherwise fails [ci skip]

`-2200000000` can't be converted to integer on x86, so the constructor
call would fail.

Author: cmb69

ext/com_dotnet/tests/bug73679.phpt

@@ -2,7 +2,9 @@
 Bug #73679 DOTNET read access violation using invalid codepage
 --SKIPIF--
 <?php # vim:ft=php
-if (!extension_loaded("com_dotnet")) print "skip COM/.Net support not present"; ?>
+if (!extension_loaded("com_dotnet")) print "skip COM/.Net support not present";
+if (PHP_INT_SIZE != 8) die("skip this test is for 64bit platforms only");
+?>
 --FILE--
 <?php