Comment 1 for bug 1910830

The build failure is fixed in Debian, but it requires a complex merge, including
special handling of s390x instruction set and cross-compilation of Z14 on Z13.

Also, there are some incompatibilities between the new debhelper-compat 13 and
the previous dh-exec logic.

I prepared a merge from Debian in a PPA, this fixes the FTBFS:
https://launchpad.net/~slyon/+archive/ubuntu/plusone-hh-freeze/+packages