[scripts] Fix build-multi.sh script
[scripts] Fix build-multi.sh script

`build-multi.sh` failed with newer sbuild versions (as available
on focal) because `--make-binNMU` and `--arch-any` can't be used
together. This change uses the `--binNMU-changelog` parameter
instead which is available since sbuild 0.73, and so should work
on all still supported Ubuntu versions.

Change-Id: Ib9aa54c859946bccb7c032e65518828972363bd1

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts