devel/root: Remove 12.3 workaround and clean up

Remove build workaround for 12.3 re-added in last commit by mistake that
was removed in 5693229 commit.
Cleanup port and delete scripts dir used by workaround.

PR: 270625
MFH: 2023Q2 (buildfixes)
(cherry picked from commit 41a479ef801eb1f07456637e90afdecce951659b)