Utils: Drop QProcess specific parameters from QtcProcess::finished()

Mid-term plan is to concentrate on use of QtcProcess::result()
instead which is a bit more system-agnostic.

There's quite a bit of potential for downstream cleanup by
re-using QtcProcess::exitMessage() now.

Change-Id: I3806b3f5933d96e64b7cfb18cc6c52823fddcbcd
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cmakeprojectmanager/cmakeprocess.h

@@ -64,12 +64,13 @@ public:
     void processStandardError();
 
     int lastExitCode() const { return m_lastExitCode; }
+
 signals:
     void started();
     void finished();
 
 private:
-    void handleProcessFinished(int code, QProcess::ExitStatus status);
+    void handleProcessFinished();
     void checkForCancelled();
 
     std::unique_ptr<Utils::QtcProcess> m_process;