Release 0.15.5

I think this the last round of backports for now -- I see no other easy
and obviously-safe things to cherry-pick.

Fix version in change log

Cut release

Release 0.15.2

Very minor, just a build system thing. See change log.

Release 0.15.1

Merge #491

491: tests: use proper exit code to mark tests as skipped r=Mic92 a=Mic92



Co-authored-by: Jörg Thalheim <joerg@thalheim.io>

bump version

Merge #447

447: Split segment size fix r=Mic92 a=otherjason



Co-authored-by: Jason <otherjason@nodomain.com>

Merge pull request #441 from NixOS/ci

bump version 0.17.0

no newline in version file