Replace deprecated Android function ALooper_pollAll

[Mercotui]

This MR should close #4166

This is my best effort replacement of the ALooperPollAll function that was deleted in ndk-r27.

To be clear, I have exactly zero experience with this API and the NDK,
and barely any experience with android in general.
But I'll explain my reasoning for these changes:

The documentation for ALooperPollAll claims:

Like ALooper_pollOnce(), but performs all pending callbacks until all data has been consumed or a file descriptor is available with no callback.

And then the documentation for ALooper_pollOnce claims:

Returns ALOOPER_POLL_TIMEOUT if there was no data before the given timeout expired.

So it seems reasonable to me to just call ALooper_pollOnce until we get TIMEOUT, which means no events left to process.

I have tested these changes by compiling and running the Gestures example,
raylib/examples/core/core_input_gestures.c. This seemed to work well on my phone.

Noting my lack of experience in this area, I really welcome feedback on how to improve and/or verify these changes.

[raysan5]

@Mercotui Thanks! It looks good to me! 😄