RFR: 8304911: Use OperatingSystem enum in some modules

[Naoto Sato]

On Tue, 4 Apr 2023 19:22:48 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> With the addition of `jdk.internal.util.OperatingSystem` references to the system property `os.name` can be replaced.
> This PR exports jdk.internal.util to:
>  - java.prefs,
>  - java.security.jgss,
>  - java.smartcardio,
>  - jdk.charsets,
>  - jdk.net,
>  - jdk.zipfs

LGTM

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Marked as reviewed by naoto (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13335#pullrequestreview-1371756979