From: Prarit Bhargava on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1641#note_8725...
v2: DISTRO_BUILD must be evaluated after the VERSION_ON_UPSTREAM check as
DISTRO_BUILD depends on PREBUILD. Move DISTRO_BUILD, KABI_TARBALL, and
the KABIDW* variables after the VERSION_ON_UPSTREAM check.