Removes a compilation warning and a crash when gmsh was run with the gui unavailable.

Common/OpenFile.cpp

@@ -460,9 +460,11 @@ void OpenProject(std::string fileName)
     CTX::instance()->recent_files[0] = fileName;
     if (CTX::instance()->history_size < 5)
       CTX::instance()->history_size++;
-    FlGui::instance()->menu->fillRecentHistoryMenu();
+#if defined(HAVE_FLTK)
+    if(FlGui::available())
+      FlGui::instance()->menu->fillRecentHistoryMenu();
+#endif
   }
-  
   CTX::instance()->lock = 0;
 
 #if defined(HAVE_FLTK)

Fltk/pluginWindow.cpp

@@ -113,7 +113,7 @@ static void add_scripting(GMSH_PostPlugin *p, PView *view)
   if(view){
     for(int i = 0; i < p->getNbOptions(); i++){
       if(p->getOption(i)->str == "iView") {
-        oldIndex = p->getOption(i)->def;
+        oldIndex = (int)(p->getOption(i)->def);
         p->getOption(i)->def = view->getIndex();
       }
     }