RFR: 8304911: Use OperatingSystem enum in some modules [v3]

[Andrey Turbanov]

On Wed, 5 Apr 2023 15:48:02 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
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Backout unneeded changes to module-info and default.policy.
>   Fixup formatting.

src/java.prefs/share/classes/java/util/prefs/Preferences.java line 299:

> 297:         String platformFactory = switch (OperatingSystem.current()) {
> 298:             case WINDOWS -> "java.util.prefs.WindowsPreferencesFactory";
> 299:             case MACOS ->  "java.util.prefs.MacOSXPreferencesFactory";

Suggestion:

            case MACOS -> "java.util.prefs.MacOSXPreferencesFactory";

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PR Review Comment: https://git.openjdk.org/jdk/pull/13335#discussion_r1160525650