We need to use org.nemomobile.ofono.ModemManager API to notify ofono
that we need to download MMS so that it enables mobile data for the
appropriate SIM. If it's different from the currently selected data SIM,
then connman will be prevented from using mobile data while MMS download
is taking place.

That allows to eliminate dependency on ImageMagick.
Qt/ImageMagick switch is located in mms-lib/Config.mak