hide instant upload icon on Android pre-lollipop

src/com/owncloud/android/ui/activity/DrawerActivity.java

@@ -166,6 +166,11 @@ public abstract class DrawerActivity extends ToolbarActivity implements DisplayU
             setupDrawerMenu(mNavigationView);
 
             setupQuotaElement();
+
+            // show folder sync menu item only for Android 5+
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+                mNavigationView.getMenu().removeItem(R.id.nav_folder_sync);
+            }
         }
 
         setupDrawerToggle();