CMake: Prepare postponing formatter settings creation

This is still an overall quirky setup.

Change-Id: I7c1d22267bb76d434fe2f9b77ed8d0bfef5ac952
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakeformatter.h

@@ -12,12 +12,6 @@ class CMakeFormatter
 {
 public:
     CMakeFormatter();
-    ~CMakeFormatter();
-
-    void applyIfNecessary(Core::IDocument *document) const;
-
-private:
-    class CMakeFormatterPrivate *d = nullptr;
 };
 
 } // CMakeProjectManager::Internal