Overlay version breaks cross-building of unity8

[Michał Sawicz]

Steps (in a vivid amd64-armhf chroot):
$ sudo apt-get -aarmhf build-dep unity8
$ sudo apt install software-properties-common
$ sudo add-apt-repository ppa:ci-train-ppa-service/stable-phone-overlay
$ sudo apt update
$ sudo apt dist-upgrade

Expected:
- all packages get upgraded to overlay versions
- it's possible to cross-build unity8

Current:
> The following packages have been kept back:
> libconnectivity-qt1:armhf libconnectivity-qt1-dev:armhf

$ sudo apt install libconnectivity-qt1:armhf libconnectivity-qt1-dev:armhf
> The following packages will be REMOVED:
> libandroid-properties1:armhf libhardware-dev:armhf libhardware2:armhf
> libhybris-common1:armhf liboxideqt-qmlplugin:armhf liboxideqtcore0:armhf
> liboxideqtquick0:armhf qtdeclarative5-ubuntu-web-plugin:armhf

And unity8 can't be built because either of those deps are missing.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: libconnectivity-qt1:armhf 0.5.1+15.04.20150708.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jul 13 09:52:07 2015
PackageArchitecture: armhf
SourcePackage: indicator-network
UpgradeStatus: No upgrade log present (probably fresh install)