MarbleRunnerManager.cpp: Fix mingw64 compiler error
MarbleRunnerManager.cpp: Fix mingw64 compiler error

Cast to (quintptr) instead of (long) in debug messages.

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