Sandbox: [skip ci] fix build failures

src/Mod/Sandbox/App/DocumentThread.cpp

@@ -31,6 +31,7 @@
 
 #include <Base/Console.h>
 #include <Base/Sequencer.h>
+#include <Base/Stream.h>
 #include <Base/Writer.h>
 #include <Base/Interpreter.h>
 #include <App/Application.h>
@@ -88,7 +89,7 @@ void WorkerThread::run()
 
 // --------------------------------------
 
-QMutex PythonThread::mutex(QMutex::Recursive);
+QRecursiveMutex PythonThread::mutex;
 
 PythonThread::PythonThread(QObject* parent)
   : QThread(parent)