Clang: Fix call of already destroyed virtual table

Task-number: QTCREATORBUG-16597
Change-Id: Ic5391ba7529de5b5ef5de260f4a5e831003ffbf6
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/libs/clangbackendipc/connectionclient.h

@@ -50,7 +50,6 @@ class CMBIPC_EXPORT ConnectionClient : public QObject
 
 public:
     ConnectionClient();
-    ~ConnectionClient();
 
     void startProcessAndConnectToServerAsynchronously();
     bool disconnectFromServer();