Add quit event to queue without using private SDL method

AerofoilMac/AerofoilMac/AerofoilApplication.mm

@@ -0,0 +1,13 @@
+#import "AerofoilApplication.h"
+#include "SDL.h"
+
+@implementation AerofoilApplication
+
+- (void)terminate:(id)sender {
+	SDL_Event event;
+	event.quit.type = SDL_QUIT;
+	event.quit.timestamp = SDL_GetTicks();
+	SDL_PushEvent(&event);
+}
+
+@end