CMake: Even less indirection

Change-Id: If9990f81e4150802dd08e0fc17a1faceb32e0cc6
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildsystem.h

@@ -113,6 +113,9 @@ public:
 
 signals:
     void configurationCleared();
+    void configurationChanged(const CMakeConfig &config);
+    void errorOccurred(const QString &message);
+    void warningOccurred(const QString &message);
 
 private:
     enum ForceEnabledChanged { False, True };