+ simplify porting of ReverseEngineering module to Python3

src/Mod/ReverseEngineering/App/AppReverseEngineering.cpp

@@ -524,8 +524,7 @@ Mesh.show(m)
 
 
 /* Python entry */
-extern "C" {
-void ReenExport initReverseEngineering()
+PyMODINIT_FUNC initReverseEngineering()
 {
     // load dependent module
     try {
@@ -540,5 +539,3 @@ void ReenExport initReverseEngineering()
     new Reen::Module();
     Base::Console().Log("Loading ReverseEngineering module... done\n");
 }
-
-} // extern "C"

src/Mod/ReverseEngineering/Gui/AppReverseEngineeringGui.cpp

@@ -61,8 +61,7 @@ private:
 
 
 /* Python entry */
-extern "C" {
-void ReenGuiExport initReverseEngineeringGui()
+PyMODINIT_FUNC initReverseEngineeringGui()
 {
     if (!Gui::Application::Instance) {
         PyErr_SetString(PyExc_ImportError, "Cannot load Gui module in console application.");
@@ -79,5 +78,3 @@ void ReenGuiExport initReverseEngineeringGui()
      // add resources and reloads the translators
     loadReverseEngineeringResource();
 }
-
-} // extern "C" {