RFR: 8307168: Inconsistent validation and handling of --system flag arguments [v4]

[Jonathan Gibbons]

On Wed, 25 Oct 2023 06:11:52 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review these changes that fix a bug in `javac`'s validation and handling of `--system` flag arguments.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update OptionSmokeTest.java

Marked as reviewed by jjg (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16264#pullrequestreview-1700390328