linkage_checker: skip files with incompatible architectures

[carlocab]

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Some formulae include these files, and they can't always be removed.
However, they can cause spurious linkage failures, so let's skip them
when checking for linkage. See, for example, faust at
Homebrew/homebrew-core#191308.

[MikeMcQuaid]

I think rather than silently skipping having this files covered by e.g. skip_clean or some other new DSL would be nicer. As-is this seems more likely to increase the times that new formulae bundle e.g. random prebuilt binaries and we don't catch them.

[Bo98]

We already do have an audit and an exception list. This is just to fix a regression in the linkage checker after moving from ldd.

[MikeMcQuaid]

Thanks for explaining! Happy to merge.