IOS7: Remove exit for normal application termination

With the kFeatureNoQuit being now used, it should not get
there anyway.

backends/platform/ios7/ios7_osys_main.cpp

@@ -415,7 +415,4 @@ void iOS7_main(int argc, char **argv) {
 		//*stderr = NULL;
 		fclose(newfp);
 	}
-
-	// prevents hanging on exit
-	exit(0);
 }