RFR: 7903846: apidiff: test issues on Windows

[Christian Stein]

On Thu, 26 Sep 2024 18:56:36 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a fix for some issues reported when running tests on Windows.
> 
> For `GetSerialVersionUITest`, the derivation of the working directory was broken in a couple of ways, which have both been fixed:
> 1. the computation of the path name assumed all members were fields; whereas the test cases have evolved to include other complex members
> 2. the work/scratch directory was being emptied between test cases, so that only the last one remained. there is a more appropriate method to use instead, so that all the working files are preserved

Marked as reviewed by cstein (Committer).

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PR Review: https://git.openjdk.org/apidiff/pull/16#pullrequestreview-2333944801