CMake: Write creators settings into build directory

Write a file qtcsettings.cmake into the build directory. This
file contains all applicable CMake configuration settings that
creator wants to set.

Use "cmake -C qtcsettings.cmake .." to reconfigure on the command
line to make use of this file.

Change-Id: I4a69d082c50bb66e60b4eec1b3155df53e00734d
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/cmakeprojectmanager/cmakeprocess.h

@@ -47,8 +47,6 @@ public:
     CMakeProcess(const CMakeProcess&) = delete;
     ~CMakeProcess();
 
-    static QStringList toArguments(const CMakeConfig &config, const Utils::MacroExpander *expander);
-
     void run(const BuildDirParameters &parameters, const QStringList &arguments);
 
     QProcess::ProcessState state() const;