Description:
------------
Problem:
When function rerouting is enabled (wincache.reroute_enabled=1), the WinCache 
wrappers for unlink/rmdir do not clear the resolve path cache.  Subsequent
calls to file_exists erroneously report the removed files as still existing.

Test script:
---------------
<?php

$tmpdir = sys_get_temp_dir() . "/ericsten/";
$wait = 1;
$max_wait = 10;

/* pre-create */

if (file_exists($tmpdir))
{
    echo "Directory: " . $tmpdir . " Exists, and it shouldn't! <BR>\n";
}

/* create */
mkdir($tmpdir);

/* verfiy */
if (file_exists($tmpdir))
{
    echo "Directory: " . $tmpdir . " Created! <BR>\n";
}
else
{
    http_response_code(500);
    echo "Directory: " . $tmpdir . " Failed to create? <BR>\n";
}

/* remove */
rmdir($tmpdir);

/* verify removed */
if (file_exists($tmpdir))
{
    http_response_code(500);
    echo "Directory: " . $tmpdir . " Exists, even though we deleted it! <BR>\n";
}
else
{
    echo "Directory: " . $tmpdir . " Removed. <BR>\n";
    exit;
}

/* wait if not removed */
$total_wait = 0;
while ($total_wait < $max_wait)
{
    sleep($wait);
    $total_wait += $wait;
    if (file_exists($tmpdir))
    {
        http_response_code(500);
        echo "Directory: " . $tmpdir . " Still Exists, even though we waited ". $total_wait ." seconds! <BR>\n";
    }
    else
    {
        http_response_code(200);
        echo "Directory: " . $tmpdir . " Removed after " . $total_wait . " seconds. <BR>\n";
        break;
    }
}

?>

Expected result:
----------------
immediately after calling rmdir or unlink, the file_exists function should return FALSE for the removed item.

Actual result:
--------------
WordPress updates fail to install, and winds up deleting the existing theme/extension because it thinks the directory still exists.