Android APK Fails / INSTALL_PARSE_FAILED_NO_CERTIFICATES
As a test, I used one of the examples:

```
import nimx / [ window, layout, button, text_field ]

runApplication:
    let w = newWindow(newRect(50, 50, 500, 150))
    w.makeLayout: # DSL follows
        - Label as greetingLabel: # Add a view of type Label to the window. Create a local reference to it named greetingLabel.
            center == super # center point of the label should be equal to center point of superview
            width == 300 # width should be 300 points
            height == 15 # well, this should be obvious now
            text: "Press the Greet button to see the greeting" # property "text" should be set to whatever the label should display
        - Button: # Add a view of type Button. We're not referring to it so it's anonymous.
            centerX == super # center horizontally
            top == prev.bottom + 5 # the button should be lower than the label by 5 points
            width == 100
            height == 25
            title: "Greet"
            onAction:
                greetingLabel.text = "Hello, world!"
```

I tried to compile it for Android as shown in [the docs](https://github.com/yglukhov/nimx/blob/master/doc/building-for-different-platforms.md):

`nake -d:release droid`

It compiled an APK but when I try to `adb install my.apk` I get:

```
Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES: Package /data/app/vmdl2089766639.tmp/base.apk has no certificates at entry AndroidManifest.xml]
```

Nim Compiler Version 1.2.4