Bug#875728: Patch for multi-arch builds

[Simon McVittie]

On Mon, 02 Jul 2018 at 11:02:40 +0000, Hugh McMaster wrote:
> As of last weekend, no packages in Debian call `dh_gtkmodules' anymore.
> 
> So, we are free to make libgtk2.0-dev and its dependencies multi-arch installable.
> 
> A patch is attached.

Thanks, trying this out now.

    smcv