community/cabal: revise bootstrap setup
From #alpine-devel
:
1637226197 (ncopa) second thing is, can cabal itself be used to build next version?
1637226228 (ncopa) if so, then maybe it should have a provides="cabal-bootstrap=$pkgver-r$pkgrel"
See also https://lists.alpinelinux.org/~alpine/devel/%3C33KG0XO61I4IL.2Z7RTAZ5J3SY6%408pit.net%3E