SOLR-14786: Delete ancient patch file

[arafalov]

Description

dev-tools/scripts/SOLR-2452.patch.hack.pl is not used for anything for many years, but still shows up in cleanup searches.

Solution

Just delete it.

Checklist

Please review the following and check all that apply:

• I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• I have created a Jira issue and added the issue ID to my pull request title.
• I have given Solr maintainers access to contribute to my PR branch. (optional but recommended)
• I have developed this patch against the master branch.
• I have run ./gradlew check.
• I have added tests for my changes.
• I have added documentation for the Ref Guide (for Solr changes only).