Bug#881646: don't build multilib library packages in stage1

[YunQiang Su <wzssyqa@gmail.com>]

Control: merge 881454 881646

On Mon, 13 Nov 2017 21:37:57 +0100 Matthias Klose <doko@debian.org> wrote:
> Package: src:glibc
> Version: 2.24-17
> Severity: important
> Tags: patch
>
> The recent debhelper changes expose a bug building stage1, because glibc build
> the multilib library packages in stage1, which shouldn't be built (only all dev
> packages should be built).
>

Hi，Matthias,
I don't think disabling multilib is not required for stage1.
Disabling shared-library should be enough.

See: #881454

>