[3.13] gh-130379: Fix incorrect zipapp logic to avoid including the target in itself (gh-130509) (gh-130791)

gh-130379: Fix incorrect zipapp logic to avoid including the target in itself (gh-130509)
(cherry picked from commit 64ccbbbf367c7510090a6f5faf826a21102a8bc6)

Co-authored-by: Paul Moore <p.f.moore@gmail.com>