[rubygems/rubygems] Excluding local platform from lockfile should not affect musl vs gnu case

This case is for not locking things like `arm-darwin-23` when the
lockfile already includes `arm-darwin`, so that we don't infinitely keep
redundant versioned platforms in the lockfile when not necessary.

We detect this with `Gem::Platform#===`. For example,
`Gem::Platform.new("arm-darwin-23") === Gem::Platform.new("arm-darwin")`
but they're not `==`.

However, in the case of `-musl` vs `-gnu`, those act as the platform
"version", but `===` is not commutative for them. This is explained in
`===` docs.

We only want to exclude the local platform in situations when
`Gem::Platform#===` is actually commutative.

https://github.com/rubygems/rubygems/commit/8099c4face

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