libjpeg-turbo: update to 3.0.0

[mohd-akram (Mohamed Akram)]

Maintainer Notes:

• This must be done with extreme caution - and with a great amount of care and pre-testing - as this is a foundational port. (With 340+ dependents, as of 2023-07-16.)

• Upstream's release notes mention that there are some breaking changes, including removal of deprecated APIs. This almost guarantees that some ports - particularly those that are older, and/or no longer maintained by upstream - will break.

Given all of the above, this will take plenty of time before we can update. And ultimately, it's possible that we may have to create a new segregated port - say, libjpeg-turbo-3 - to maintain backward compatibility for those ports that don't work with 3.x.