1. mach_portal: Improve amfid patch to support fat binaries

    Ian Beer did an incredible work with his iOS 10.1.1 exploit. The mach_portal proof of concept gives you a root shell on iOS 10.1.1. You can read more about it here: https://bugs.chromium.org/p/project-zero/issues/detail?id=965 While playing with it, I discovered that the amfid patch was only supporting thin arm64 binaries. I did not find a fix online so here is my solution.
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