Updated Development and Debugging on Android (markdown)

Development-and-Debugging-on-Android.md

@@ -5,6 +5,14 @@ Obtaining source code, required build tools etc are described in [readme](https:
 * [getting-the-source](https://github.com/koreader/koreader/blob/master/README.md#getting-the-source)
 * [for-android-devices](https://github.com/koreader/koreader/blob/master/README.md#for-android-devices)
 
+## Build x86 apk file:
+`ANDROID_ARCH=x86 ./kodev build/release/run android`
+
+Don't forget to `./mk-luajit.sh clean` in luajit-launcher when changing architectures.
+
+More info: https://github.com/koreader/koreader/pull/3353
+
+
 # Display logs
 `./kodev log android`
 or to see all android logs: