ACK/APPLIED[B]: [PATCH][AB] fix do_libc_dev_package breakage

[Seth Forshee]

On Wed, Dec 13, 2017 at 11:44:24AM -0800, Kamal Mostafa wrote:
> Our do_libc_dev_package vars feature was broken by debhelper deprecating
> dh_clean in favor of dh_prep.
> 
> To support custom kernels derived from {Artful, Bionic}, only try to
> dh_prep linux-libc-dev if do_libc_dev_package=true.
> 
> This results in no changes to the master kernels, just allows derivs to
> override standard behaviors.

Acked-by: Seth Forshee <seth.forshee at canonical.com>

Applied to bionic/master-next and unstable/master. Thanks!