Improve updated JACK autobuild (#3003)

[ann0see]

Short description of changes
Post merge #3003 applies comments by @pljones

CHANGELOG: Internal: The JACK build will now install directly from the JACK GitHub repository

Context: Fixes an issue?

Fixes: #3012

Does this change need documentation? What needs to be documented and how?

No

Status of this Pull Request

Ready for review

What is missing until this pull request can be merged?

Review

Checklist

• I've verified that this Pull Request follows the general code principles
• I tested my code and it does what I want
• My code follows the style guide
• I waited some time after this Pull Request was opened and all GitHub checks completed without errors.
• I've filled all the content above

[pljones]

Looks good, force merging.

Downloading 64 Bit and 32 Bit JACK installer (if needed)...
Installing JACK2 64-bit...
64bit JACK installation completed successfully
Installing JACK2 32-bit...
32bit JACK installation completed successfully