ClangSupport: Clean up destructors

Clean up destructors in the class hierarchy based on IpcInterface.

Change-Id: Ia79784243858fff619a9df534384a7bca18f2bd0
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/libs/clangsupport/ipcserverinterface.h

@@ -30,9 +30,6 @@
 namespace ClangBackEnd {
 
 class IpcServerInterface : public IpcInterface
-{
-protected:
-    ~IpcServerInterface() = default;
-};
+{};
 
 } // namespace ClangBackEnd