debian packaging refinements

From: Enrico Weigelt, metux IT consult
Date: Mon Feb 11 2019 - 07:04:05 EST

Hi folks,

here're some small patches for making mkdebian a bit more flexible, so it
can be used eg. with an given debian/rules file.

I'm using this along w/ local (adding debian/rules and .config) in order
to build the kernel via usual debian toolchains (git-buildpackage,
git-buildpackage, ...) in a canonical way.

Didn't post the patch for debian/rules yet, as it's likely not suited for
mainline yet. (I can post it, if you wish).