Add excludes to Android Gradle files to prevent common errors due to expected duplicates

Issue details

Currently the Android project can fail to compile (due to detected duplicate files in included libraries) even if the files are somewhat expected - like licenses or RoboVM meta-data.

Proposed solution: add something along these lines to Android build.gradle files.

Reproduction steps/code

You can easily reproduce this issue by including two libraries with robovm.xml, like gdx-kiwi and gdx-lml. See https://github.com/czyzby/gdx-lml/issues/46

Use these dependencies in the core or android Gradle project to reproduce the issue due to duplicate META-INF/robovm/ios/robovm.xml file:

    dependencies {
        // ...
        compile "com.github.czyzby:gdx-lml:1.9.1.9.4-SNAPSHOT"
        compile "com.github.czyzby:gdx-autumn:1.9.1.9.4-SNAPSHOT"
        compile "com.kotcrab.vis:vis-ui:1.1.1"
    }

Version of LibGDX and/or relevant dependencies

gdx-setup 1.9.4 (and below).

Affected platforms

• Android
• iOS (robovm)
• iOS (MOE)
• HTML/GWT
• Windows
• Linux
• MacOS

[Tom-Ski]

You have duplicate robovm.xml files in the same jar, what is the reason for that? If you can provide an example where this happens due to valid dependencies we can do something about this, but this looks like an issue in your artifacts.

[Tom-Ski]

Thanks for the reproducible example.