ClangTools: Do not abort a running build when starting to analyze

Task-number: QTCREATORBUG-29044
Change-Id: Iec6259d1734f809aba9da00f3f6a63fea2b93967
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangtools/clangtoolruncontrol.cpp

@@ -55,6 +55,7 @@ private:
 
         connect(BuildManager::instance(), &BuildManager::buildQueueFinished,
                 this, &ProjectBuilder::onBuildFinished, Qt::QueuedConnection);
+        if (!BuildManager::isBuilding(target))
             BuildManager::buildProjectWithDependencies(target->project());
      }