[Android (C)] custom material_shaders (not working)

When adding a custom shader to a material like this example here :
https://github.com/armory3d/armory_examples/tree/master/material_shaders/Shaders

you will get an error on Android:
```
2020-12-22 17:16:23.163 22316-23462/my.app.com D/hl: Uncaught exception: Can't cast dynobj to iron.data.TSceneFormat
2020-12-22 17:16:23.164 22316-23462/? V/threaded_app: android_app_destroy!
```

and this is the only reference I found on this error so far:
https://github.com/HaxeFoundation/haxe/issues/6206

Seems like we have to make sure that objects we are comparing/using are of the same type, somewhere in the code.

Start with the custom shader files in the linked armory_examples material_shaders/Shaders example and reproduce the Android failure. Trace the reported dynobj-to-iron.data.TSceneFormat cast error, then verify that the example runs on Android without the crash.

Written by the indexing model from the issue text.