external/build_all.sh script is broken

Hi!

I do not understand purpose of https://github.com/adoptium/aqa-tests/blob/master/external/build_all.sh. I addition, it seems it is unused, because - per https://github.com/adoptium/aqa-tests/pull/5553#issuecomment-2346692535 - it was broken since 6.February.2024, and nobody noticed.

of course I may be absolutely missing some point, and despite several quiestions on several places, I never got an reply. Looking forward for explanation!

Start by reading external/build_all.sh and the referenced pull request #5553 comment to establish when and why the script became broken. Search the repository for references to the script and determine whether it is still used; done requires a maintainer decision on its purpose and whether it should be repaired, documented, or removed.

Written by the indexing model from the issue text.