incorrect multi-arch related meta information.

[Tomas Sandven]

It appears to be missing the Multi-Arch: allowed header so it won't satisfy an i386 package depending on it.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity-gtk-module-common 0.0.0+13.10.20130716.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Wed Dec 18 02:30:03 2013
Dependencies:

InstallationDate: Installed on 2013-12-14 (3 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: unity-gtk-module
UpgradeStatus: No upgrade log present (probably fresh install)