Upgrade to NDK r28 for Android 16 KB page size compatibility

[david-metrica]

Starting Nov 1, 2025, new apps and updates targeting Android 15+ must support 16 KB pages. By May 1, 2026, updates to existing apps that don’t support this will be blocked on the Play Store.

Currently, crates depending on ndk / ndk-sys are tied to older NDK versions that assume 4 KB page sizes. For example, I noticed this when building web-audio-api-rs, which indirectly pulls in ndk through cpal.

To ensure future compatibility, it would be good to update ndk / ndk-sys to build against NDK r28 or higher, which supports 16 KB page sizes.

You can also refer to the related issue I opened in cpal, in case there is an easier solution at that layer:
RustAudio/cpal#1018

[MarijnS95]

The ndk-sys crate only provides types and symbols generated from headers in the Android NDK (using bindgen), and ndk provides high-level safe Rusty wrappers around them. This version only determines (to some extent) what API bindings are available but have nothing to do with how your app (and/or dependent shared objects) is/are finally linked and how the resulting APK is aligned.

That is up to the tools and/or installed Android NDK you use for compiling your Rust crate into an APK. For cargo-apk, see rust-mobile/cargo-apk#76.