RFR: 7903837: apidiff: build.sh issues on Windows [v4]

[Iris Clark]

On Mon, 30 Sep 2024 22:10:25 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review some `build.sh` and `Makefile` changes to address issues building on Windows.
>> 
>> The primary Windows issue was missing use of `mixed_path` when passing some filenames into `make`.
>> There is some additional cleanup (for all platforms) to normalize the `DEPS_DIR` and add missing items to the `sanity` and `check_build_vars` targets.
>> 
>> This has been tested on macOS. Can someone with access to a Windows machine test it on Windows, please?
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add EQUINOX_JAR, per suggestion in review

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/apidiff/pull/12#pullrequestreview-2341097472