The special handling was needed when the alpine-base package included release
and other data. This was changed[0] and now the complete alpine-release package
is included in the minirootfs[1]. This change removed the reason the special
handling was added in the first place so we can remove it completely.

Fixes #16553

[0]: fluix/aports@23e66e85
[1]: alpine/aports@704af9b4