[fw-core] Zend_Loader::isReadable fix

I'm getting annoyed by the errors the isReadable function gives because it's
trying to open non-existing files (which get suppressed).
Why not use file_exists in conjuction with file_open? It won't give (as
many) errors with the same implementation.

There was an alternative fix, but it got revert because it broke the BC
(which is what?).

SO:

public static function isReadable($filename)
{
if (!file_exists($filename) || !$fh = @fopen($filename, 'r', true))
{
return false;
}
@fclose($fh);
return true;
}
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