Brian Smith 32e007fc88 Use Android NDK 25 and work around Rust/Android incompatibilities.
Use Android NDK 25 since that's GitHub Actions is moving to. SDK level
is the minimum supported, and there are no longer target-specific
allases for `llvm-ar`; update cargo.sh accordingly.

Use the environment variables recommended by the Android documentation.

Work around compatibility issue with Rust and Android NDKs.

Remove out-of-date documentation aboud building for Android.
2022-10-19 23:49:17 -07:00
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