Fixed a bug where FlexBox would still be compiled on older versions of VS

examples/Demo/Source/Demos/FlexBoxDemo.cpp

@@ -24,7 +24,8 @@
 
 #include "../JuceDemoHeader.h"
 
-#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS // the FlexBox classes are C++11-only
+// these classes are C++11-only
+#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS && JUCE_COMPILER_SUPPORTS_INITIALIZER_LISTS && JUCE_COMPILER_SUPPORTS_LAMBDAS
 
 struct DemoFlexPanel   : public juce::Component,
                          private juce::TextEditor::Listener,

modules/juce_gui_basics/juce_gui_basics.cpp

@@ -253,7 +253,8 @@ extern bool juce_areThereAnyAlwaysOnTopWindows();
 #include "misc/juce_BubbleComponent.cpp"
 #include "misc/juce_DropShadower.cpp"
 
-#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS // these classes are C++11-only
+// these classes are C++11-only
+#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS && JUCE_COMPILER_SUPPORTS_INITIALIZER_LISTS && JUCE_COMPILER_SUPPORTS_LAMBDAS
  #include "layout/juce_FlexBox.cpp"
 #endif
 

modules/juce_gui_basics/juce_gui_basics.h

@@ -282,7 +282,8 @@ class FlexBox;
 #include "lookandfeel/juce_LookAndFeel_V1.h"
 #include "lookandfeel/juce_LookAndFeel_V3.h"
 
-#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS // these classes are C++11-only
+// these classes are C++11-only
+#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS && JUCE_COMPILER_SUPPORTS_INITIALIZER_LISTS && JUCE_COMPILER_SUPPORTS_LAMBDAS
 #include "layout/juce_FlexItem.h"
 #include "layout/juce_FlexBox.h"
 #endif