CppTools: Suppress the c++98-compatibility warnings

Fixes: QTCREATORBUG-23118
Change-Id: I3c29faa05cb77841b22201dce01b341e565ca32d
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cpptools/cpptoolsreuse.cpp

@@ -366,6 +366,7 @@ static void addBuiltinConfigs(ClangDiagnosticConfigsModel &model)
     config.setClangOptions({
         "-Wall",
         "-Wextra",
+        "-Wno-c++98-compat"
     });
     model.appendOrUpdate(config);