cpu: add cpuid stub for non-linux platforms

[marquiz]

Make it possible to do non-linux builds. Code compiles, at least, even
if the feature detection functionality is virtually Linux-only.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[marquiz]

#803

[marquiz]

@mathuvenkat can you verify/confirm that this fixes your issue (on darwin/arm64).
/assign @ArangoGutierrez

[ArangoGutierrez]

@mathuvenkat can you verify/confirm that this fixes your issue (on darwin/arm64). /assign @ArangoGutierrez

I have 2 Linux machines at home ;P , going to ask for a friend to test this out on Mac and report back later this week

[wabouhamad]

@ArangoGutierrez make build completed successfully on Mac A1 and the 3 binaries are produced:
uname -a
Darwin -mac 21.4.0 Darwin Kernel Version 21.4.0: Fri Mar 18 00:46:32 PDT 2022; root:xnu-8020.101.4~15/RELEASE_ARM64_T6000 arm64

In node-feature-discovery/bin
$ ls -ltr
total 193880
-rwxr-xr-x 1 <my_user> staff 20466992 May 11 09:00 nfd-worker
-rwxr-xr-x 1 <my_user> staff 38640480 May 11 09:00 nfd-master
-rwxr-xr-x 1 <my_user> staff 40156752 May 11 09:00 nfd-topology-updater

[ArangoGutierrez]

/lgtm
/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ArangoGutierrez, marquiz

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[marquiz]

Thanks @ArangoGutierrez
/unhold