Imagebuilder cleanup

https://openwrt.org/docs/guide-user/additional-software/imagebuilder

Remove useless files from firmware

What are the files in the 1. Create file 'files_remove' with full filenames: section?

The example demonstrates removing files that would never be used ( or at least cause minimal impact ) to save space... on the "specific system"

The files shown are netfilter kernel modules for a "3.10.49" system.

The majority of OpenWrt is highly optimised to minimise space usage... the advanced example shown, would really only come in handy for some "non-standard" packages imho... and even then you'd need an in depth understanding to use it safely...

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