Fix icu4c source dists not including an actual LICENSE file

[Phenix66]

This fixes an issue introduced by https://unicode-org.atlassian.net/browse/ICU-21964

When attempting to build the library from the icu4c-74_2-src.tgz release artifact, I received an error from make install about a nonexistent file ../LICENSE. This was because the symlink was included in the dist that then references a file outside of the dist. Simple fix, just make the actual file is included when building the dist in the pipeline.

Checklist

• Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-_____
• Required: The PR title must be prefixed with a JIRA Issue number.
• Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
• Required: Each commit message must be prefixed with a JIRA Issue number.
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable

[CLAassistant]

All committers have signed the CLA.

[markusicu]

@mihnita @srl295 this seems to say that ICU-22601 PR #2749 was not sufficient?

[srl295]

@mihnita @srl295 this seems to say that ICU-22601 PR #2749 was not sufficient?

https://github.com/unicode-org/icu/releases/tag/release-74-2 It doesn't look like anyone ever copied the FIXED .tgz over, regenerated the checksums, and moved the 74.2 out of pre-release?

[srl295]

@Phenix66 can you check the files marked src-FIXED... in https://github.com/unicode-org/icu/releases/tag/release-74-2 ? those were created with PR #2749 but were waiting for updates to the hashes and signatures to be put in place.

[Phenix66]

@Phenix66 can you check the files marked src-FIXED... in https://github.com/unicode-org/icu/releases/tag/release-74-2 ? those were created with PR #2749 but were waiting for updates to the hashes and signatures to be put in place.

That did it, judging by the dates of those artifacts I just missed that they were there when I downloaded the archive. Thank you!

[srl295]

@Phenix66 well, they need to be moved to replace the other ones..

[thesamesam]

It looks like the fixed signatures are still missing?