Turns out that debian has mawk by default, which is not behaving the
same in our very simple use case already. In passing, add gawk as a
build dependency of the debian package, because the packaging is meant
to exercize the test cases.
This packaging requires all pgloader dependencies to be available as a
debian package within the distribution, which is an work-in-progress
happening concurrently to this patch.
The current situation allows to actually build the pgloader package the
proper way already, some more needs to happen before anybody can do that
from a public debian repository.
