Fix compiler warnings (#11984)

- Define OpenCL version in ParModelica to get rid of warnings about
  deprecated functions.
- Use QPalette::Window instead of deprecated QPalette::Background.

OMCompiler/SimulationRuntime/ParModelica/explicit/openclrt/omc_ocl_common_header.h

@@ -43,6 +43,8 @@
 #ifndef _OMC_OCL_COMMON_HEADER
 #define _OMC_OCL_COMMON_HEADER
 
+#define CL_TARGET_OPENCL_VERSION 120
+
 #include <stdio.h>
 #ifdef __APPLE__
 #include <OpenCL/cl.h>
@@ -53,8 +55,6 @@
 #include <stdarg.h>
 #include <sys/time.h>
 
-
-
 #define MAX_DEVICE 4
 #define SHOW_DEVICE_SELECTION
 // #define SHOW_ARG_SET_ERRORS

OMPlot/OMPlot/OMPlotGUI/PlotWindow.cpp

@@ -64,7 +64,7 @@ PlotWindow::PlotWindow(QStringList arguments, QWidget *parent, bool isInteractiv
 {
   /* set the widget background white. so that the plot is more useable in books and publications. */
   QPalette p(palette());
-  p.setColor(QPalette::Background, Qt::white);
+  p.setColor(QPalette::Window, Qt::white);
   setAutoFillBackground(true);
   setPalette(p);
   // setup the main window widget