RFR: 8294376: Minimize disabled warnings in java.base

[Erik Joelsson]

On Mon, 26 Sep 2022 15:31:53 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> After [JDK-8294281](https://bugs.openjdk.org/browse/JDK-8294281), it is now possible to disable warnings for individual files instead for whole libraries. I used this opportunity to go through all disabled warnings in java.base native libraries.
> 
> Any warnings that were only triggered in a few files were removed from the library as a whole, and changed to be only disabled for those files.
> 
> Some warnings didn't trigger in any file anymore, and could just be removed.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10426