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Prevent cpuid get_extended_function_info panic

Jeremy Soller requested to merge tones111:cpuid_panic into master

Created by: tones111

A kernel panic occurs on some CPUs (notably qemu-system-x86_64) when calling rust-cpuid's get_extended_function_info. This is fixed upstream in commit c3ebfc553cdff98d19d29777fd85c4f9182bfb66 but has yet to make it crates.io.

The panic can by triggered by running "ls sys:" from ion and causes redox to become unresponsive.

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