Fix vsync not being enabled in IMMEDIATE present mode. MVK_MACOS was not being defined.
diff --git a/MoltenVK/MoltenVK/Utility/CAMetalLayer+MoltenVK.m b/MoltenVK/MoltenVK/Utility/CAMetalLayer+MoltenVK.m
index 14a0282..bf45f2f 100644
--- a/MoltenVK/MoltenVK/Utility/CAMetalLayer+MoltenVK.m
+++ b/MoltenVK/MoltenVK/Utility/CAMetalLayer+MoltenVK.m
@@ -17,6 +17,7 @@
  */
 
 
+#include "MVKCommonEnvironment.h"
 #import "CAMetalLayer+MoltenVK.h"
 
 @implementation CAMetalLayer (MoltenVK)