Improve support for symbolication

[Berstanio]

If a more complex native library is built, symbols are important to make sense of backtraces.
Currently iOS is the only backend that emits symbols on build.

We should add APP_STRIP_MODE := none to android. Android native libraries are stripped on deploy, so it doesn't leak symbols.

Since the desktop native libs are not post-processed before deploy, I don't see an easy way to include symbols at the moment without leaking them.