Don't modify MediaWiki's core code (e.g., SpecialAllpages.php) if you can help it. You'll make it harder to do software upgrades, as your changes will get overwritten when you update the MediaWiki software.
I would question the original poster's request. Why do you want to exclude redirects from Special:AllPages? Do you have an important business purpose for doing this, or is it just personal preference? Is there something in particular you're trying to accomplish? Other users on your wiki might like having the redirects on Special:AllPages.
DanB
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