[system/uri] Improve URI routing when head-link and sym-link are different

[gnh1201]

Troubleshooting problems when hard-link and sym-link are different. for example:

echo getcwd();
echo "<br>";
echo realpath(dirname(__FILE__));
echo "<br>";
echo readlink($_SERVER['DOCUMENT_ROOT']);
echo "<br>";
echo substr(realpath(dirname(__FILE__)), strlen($_SERVER['DOCUMENT_ROOT']));

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