Fix screensaver not building on recent versions of macOS.

Author: Tim

src/cinder/app/AppScreenSaver.cpp

@@ -26,6 +26,7 @@
 #include "cinder/CinderAssert.h"
 
 #if defined( CINDER_MAC )
+#include <list>
 	#import "cinder/app/cocoa/AppImplMacScreenSaver.h"
 	#include "cinder/app/cocoa/PlatformCocoa.h"
 	#include "cinder/ImageSourceFileQuartz.h"

src/cinder/app/cocoa/AppImplMacScreenSaver.mm

@@ -104,6 +104,9 @@ - (void)drawRect:(NSRect)rect
 		[super drawRect:rect]; // draws black by default
 		return;
 	}
+    
+    
+    [mCinderView draw];
 }
 
 - (void)animateOneFrame