Make SharedMimeInfo an optional dependency. Fixes Qt build.
Make SharedMimeInfo an optional dependency. Fixes Qt build.

tucnak/marble,probonopd/marble,tzapzoor/marble,rku/marble,rku/marble,adraghici/marble,AndreiDuma/marble,David-Gil/marble-dev,oberluz/marble,Earthwings/marble,adraghici/marble,adraghici/marble,quannt24/marble,AndreiDuma/marble,rku/marble,utkuaydin/marble,AndreiDuma/marble,utkuaydin/marble,AndreiDuma/marble,oberluz/marble,tzapzoor/marble,AndreiDuma/marble,probonopd/marble,David-Gil/marble-dev,tzapzoor/marble,Earthwings/marble,oberluz/marble,tucnak/marble,Earthwings/marble,Earthwings/marble,tzapzoor/marble,quannt24/marble,quannt24/marble,adraghici/marble,utkuaydin/marble,quannt24/marble,oberluz/marble,Earthwings/marble,AndreiDuma/marble,oberluz/marble,tucnak/marble,quannt24/marble,probonopd/marble,David-Gil/marble-dev,rku/marble,adraghici/marble,David-Gil/marble-dev,tzapzoor/marble,utkuaydin/marble,tzapzoor/marble,tucnak/marble,oberluz/marble,probonopd/marble,tucnak/marble,quannt24/marble,David-Gil/marble-dev,tzapzoor/marble,rku/marble,tucnak/marble,probonopd/marble,David-Gil/marble-dev,probonopd/marble,tucnak/marble,adraghici/marble,Earthwings/marble,utkuaydin/marble,quannt24/marble,utkuaydin/marble,rku/marble,probonopd/marble,tzapzoor/marble