golang-github-kr-pty-dev is another go library that happens to be in the
build dependency tree of many source packages that build architecture
dependent packages. I've listed three affected example packages above.
Since it is Architecture: all, it cannot satisfy cross Build-Depends at
all. Fortunately, marking it Multi-Arch: foreign is a good option here
as it doesn't have any maintainer scripts nor dependencies. Please
consider applying the attached patch to move cross building go packages
forward.
Helmut