this allows automatically running abi-check in non-fatal mode if an ABI
bump has just been done.
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
in favor of generated rules.d snippet. this allows calling
dpkg-buildpackage in the build directory manually without setting up the
environment to match.
the top-level Makefile now only prepares the build directory by copying
and patching sources and generating the real files from debian/*.in
the actual build and packaging happens in debian/rules
