ALooper_pollAll is gone in NDK 27 use ALooper_pollOnce instead

[jush]

ALooper_pollAll is gone in NDK 27.

This PR changes the code to use ALooper_pollOnce. See https://github.com/android/ndk/discussions/2020 for more context.

[jush]

@brackeen could you take a look at this changes? Thanks!

[brackeen]

Thanks for the PR @jush. I want to explore this issue a bit more deeply, will do it this week.

[jush]

@brackeen friendly ping 😄

[brackeen]

Thanks @jush, sorry for the late response. I made a small tweak and merged into main.